ClipArt ETC
A man measuring the height of a tree by determining the angle and how far away he is standing.

Measuring Tree Height

A man measuring the height of a tree by determining the angle and how far away he is standing.

Illustration showing that if two angles of a triangle are equal, the bisectors of these angles are equal.

Angle Bisectors In An Isosceles Triangle

Illustration showing that if two angles of a triangle are equal, the bisectors of these angles are equal.

Illustration showing that if equal segments measured from the vertex are laid off on the arms of an isosceles triangle, the lines joining the ends of these segments to the opposite ends of the base will be equal.

Equal Segments In An Isosceles Triangle

Illustration showing that if equal segments measured from the vertex are laid off on the arms of an…

Illustration showing that if equal segments prolonged through the vertex are laid off on the arms of an isosceles triangle, the lines joining the ends of these segments to the opposite ends of the base will be equal.

Equal Segments In An Isosceles Triangle

Illustration showing that if equal segments prolonged through the vertex are laid off on the arms of…

Illustration showing that can be used to prove that the base angles of an isosceles triangle are equal.

Base Angles In An Isosceles Triangle

Illustration showing that can be used to prove that the base angles of an isosceles triangle are equal.

Illustration showing that if equal segments measured from the end of the base are laid off on the base of an isosceles triangle, the lines joining the vertex of the triangle to the ends of the segments will be equal.

Equal Segments In An Isosceles Triangle

Illustration showing that if equal segments measured from the end of the base are laid off on the base…

Illustration showing that if equal segments measured from the end of the base prolonged are laid off on the base of an isosceles triangle, the lines joining the vertex of the triangle to the ends of the segments will be equal.

Equal Segments In An Isosceles Triangle

Illustration showing that if equal segments measured from the end of the base prolonged are laid off…

Illustration used to prove that triangle EFD is equilateral given that triangle ABC is equilateral and AE=BF=CD.

Equilateral Triangle Inscribed In An Equilateral Triangle

Illustration used to prove that triangle EFD is equilateral given that triangle ABC is equilateral and…

Illustration that uses triangles to measure the distance across a lake.

Using Triangles To Measure A Lake

Illustration that uses triangles to measure the distance across a lake.

Illustration that uses triangles to measure the distance across a river.

Using Triangles To Measure A River

Illustration that uses triangles to measure the distance across a river.

Illustration that uses triangles to measure the distance across a river.

Using Triangles To Measure A River

Illustration that uses triangles to measure the distance across a river.

Illustration that uses triangles to measure the distance across a river.

Using Triangles To Measure A River

Illustration that uses triangles to measure the distance across a river.

Illustration that uses triangles to measure the distance across a lake.

Using Triangles To Measure A Lake

Illustration that uses triangles to measure the distance across a lake.

Illustration used to show that two triangles are equal if the three sides of one are equal respectively to the three sides of the other.

Equal Triangles

Illustration used to show that two triangles are equal if the three sides of one are equal respectively…

Illustration used to show how to construct an equilateral triangle, with a given line as a side.

Construction Of Equilateral Triangle

Illustration used to show how to construct an equilateral triangle, with a given line as a side.

Illustration showing the three angle bisectors in a triangle.

Angle Bisectors In A Triangle

Illustration showing the three angle bisectors in a triangle.

Illustration showing coterminal angles of 0° and -360°. Coterminal angles are angles drawn in standard position that have a common terminal side. In this illustration, both angles are labeled with the proper degree measure.

0° and -360° Coterminal Angles

Illustration showing coterminal angles of 0° and -360°. Coterminal angles are angles drawn in…

Illustration showing coterminal angles of 5° and -355°. Coterminal angles are angles drawn in standard position that have a common terminal side. In this illustration, both angles are labeled with the proper degree measure.

5° and -355° Coterminal Angles

Illustration showing coterminal angles of 5° and -355°. Coterminal angles are angles drawn in…

Illustration showing coterminal angles of 10° and -350°. Coterminal angles are angles drawn in standard position that have a common terminal side. In this illustration, both angles are labeled with the proper degree measure.

10° and -350° Coterminal Angles

Illustration showing coterminal angles of 10° and -350°. Coterminal angles are angles drawn…

Illustration showing coterminal angles of 15° and -345°. Coterminal angles are angles drawn in standard position that have a common terminal side. In this illustration, both angles are labeled with the proper degree measure.

15° and -345° Coterminal Angles

Illustration showing coterminal angles of 15° and -345°. Coterminal angles are angles drawn…

Illustration showing coterminal angles of 20° and -340°. Coterminal angles are angles drawn in standard position that have a common terminal side. In this illustration, both angles are labeled with the proper degree measure.

20° and -340° Coterminal Angles

Illustration showing coterminal angles of 20° and -340°. Coterminal angles are angles drawn…

Illustration showing coterminal angles of 25° and -335°. Coterminal angles are angles drawn in standard position that have a common terminal side. In this illustration, both angles are labeled with the proper degree measure.

25° and -335° Coterminal Angles

Illustration showing coterminal angles of 25° and -335°. Coterminal angles are angles drawn…

Illustration showing coterminal angles of 30° and -330°. Coterminal angles are angles drawn in standard position that have a common terminal side. In this illustration, both angles are labeled with the proper degree measure.

30° and -330° Coterminal Angles

Illustration showing coterminal angles of 30° and -330°. Coterminal angles are angles drawn…

Illustration showing coterminal angles of 35° and -325°. Coterminal angles are angles drawn in standard position that have a common terminal side. In this illustration, both angles are labeled with the proper degree measure.

35° and -325° Coterminal Angles

Illustration showing coterminal angles of 35° and -325°. Coterminal angles are angles drawn…

Illustration showing coterminal angles of 40° and -320°. Coterminal angles are angles drawn in standard position that have a common terminal side. In this illustration, both angles are labeled with the proper degree measure.

40° and -320° Coterminal Angles

Illustration showing coterminal angles of 40° and -320°. Coterminal angles are angles drawn…

Illustration showing coterminal angles of 45° and -315°. Coterminal angles are angles drawn in standard position that have a common terminal side. In this illustration, both angles are labeled with the proper degree measure.

45° and -315° Coterminal Angles

Illustration showing coterminal angles of 45° and -315°. Coterminal angles are angles drawn…

Illustration showing coterminal angles of 50° and -310°. Coterminal angles are angles drawn in standard position that have a common terminal side. In this illustration, both angles are labeled with the proper degree measure.

50° and -310° Coterminal Angles

Illustration showing coterminal angles of 50° and -310°. Coterminal angles are angles drawn…

Illustration showing coterminal angles of 55° and -305°. Coterminal angles are angles drawn in standard position that have a common terminal side. In this illustration, both angles are labeled with the proper degree measure.

55° and -305° Coterminal Angles

Illustration showing coterminal angles of 55° and -305°. Coterminal angles are angles drawn…

Illustration showing coterminal angles of 60° and -300°. Coterminal angles are angles drawn in standard position that have a common terminal side. In this illustration, both angles are labeled with the proper degree measure.

60° and -300° Coterminal Angles

Illustration showing coterminal angles of 60° and -300°. Coterminal angles are angles drawn…

Illustration showing coterminal angles of 65° and -295°. Coterminal angles are angles drawn in standard position that have a common terminal side. In this illustration, both angles are labeled with the proper degree measure.

65° and -295° Coterminal Angles

Illustration showing coterminal angles of 65° and -295°. Coterminal angles are angles drawn…

Illustration showing coterminal angles of 70° and -290°. Coterminal angles are angles drawn in standard position that have a common terminal side. In this illustration, both angles are labeled with the proper degree measure.

70° and -290° Coterminal Angles

Illustration showing coterminal angles of 70° and -290°. Coterminal angles are angles drawn…

Illustration showing coterminal angles of 75° and -285°. Coterminal angles are angles drawn in standard position that have a common terminal side. In this illustration, both angles are labeled with the proper degree measure.

75° and -285° Coterminal Angles

Illustration showing coterminal angles of 75° and -285°. Coterminal angles are angles drawn…

Illustration showing coterminal angles of 80° and -280°. Coterminal angles are angles drawn in standard position that have a common terminal side. In this illustration, both angles are labeled with the proper degree measure.

80° and -280° Coterminal Angles

Illustration showing coterminal angles of 80° and -280°. Coterminal angles are angles drawn…

Illustration showing coterminal angles of 85° and -275°. Coterminal angles are angles drawn in standard position that have a common terminal side. In this illustration, both angles are labeled with the proper degree measure.

85° and -275° Coterminal Angles

Illustration showing coterminal angles of 85° and -275°. Coterminal angles are angles drawn…

Illustration showing coterminal angles of 90° and -270°. Coterminal angles are angles drawn in standard position that have a common terminal side. In this illustration, both angles are labeled with the proper degree measure.

90° and -270° Coterminal Angles

Illustration showing coterminal angles of 90° and -270°. Coterminal angles are angles drawn…

Illustration showing coterminal angles of 95° and -265°. Coterminal angles are angles drawn in standard position that have a common terminal side. In this illustration, both angles are labeled with the proper degree measure.

95° and -265° Coterminal Angles

Illustration showing coterminal angles of 95° and -265°. Coterminal angles are angles drawn…

Illustration showing coterminal angles of 100° and -260°. Coterminal angles are angles drawn in standard position that have a common terminal side. In this illustration, both angles are labeled with the proper degree measure.

100° and -260° Coterminal Angles

Illustration showing coterminal angles of 100° and -260°. Coterminal angles are angles drawn…

Illustration showing coterminal angles of 105° and -255°. Coterminal angles are angles drawn in standard position that have a common terminal side. In this illustration, both angles are labeled with the proper degree measure.

105° and -255° Coterminal Angles

Illustration showing coterminal angles of 105° and -255°. Coterminal angles are angles drawn…

Illustration showing coterminal angles of 110° and -250°. Coterminal angles are angles drawn in standard position that have a common terminal side. In this illustration, both angles are labeled with the proper degree measure.

110° and -250° Coterminal Angles

Illustration showing coterminal angles of 110° and -250°. Coterminal angles are angles drawn…

Illustration showing coterminal angles of 115° and -245°. Coterminal angles are angles drawn in standard position that have a common terminal side. In this illustration, both angles are labeled with the proper degree measure.

115° and -245° Coterminal Angles

Illustration showing coterminal angles of 115° and -245°. Coterminal angles are angles drawn…

Illustration showing coterminal angles of 120° and -240°. Coterminal angles are angles drawn in standard position that have a common terminal side. In this illustration, both angles are labeled with the proper degree measure.

120° and -240° Coterminal Angles

Illustration showing coterminal angles of 120° and -240°. Coterminal angles are angles drawn…

Illustration showing coterminal angles of 125° and -235°. Coterminal angles are angles drawn in standard position that have a common terminal side. In this illustration, both angles are labeled with the proper degree measure.

125° and -235° Coterminal Angles

Illustration showing coterminal angles of 125° and -235°. Coterminal angles are angles drawn…

Illustration showing coterminal angles of 130° and -230°. Coterminal angles are angles drawn in standard position that have a common terminal side. In this illustration, both angles are labeled with the proper degree measure.

130° and -230° Coterminal Angles

Illustration showing coterminal angles of 130° and -230°. Coterminal angles are angles drawn…

Illustration showing coterminal angles of 135° and -225°. Coterminal angles are angles drawn in standard position that have a common terminal side. In this illustration, both angles are labeled with the proper degree measure.

135° and -225° Coterminal Angles

Illustration showing coterminal angles of 135° and -225°. Coterminal angles are angles drawn…

Illustration showing coterminal angles of 140° and -220°. Coterminal angles are angles drawn in standard position that have a common terminal side. In this illustration, both angles are labeled with the proper degree measure.

140° and -220° Coterminal Angles

Illustration showing coterminal angles of 140° and -220°. Coterminal angles are angles drawn…

Illustration showing coterminal angles of 145° and -215°. Coterminal angles are angles drawn in standard position that have a common terminal side. In this illustration, both angles are labeled with the proper degree measure.

145° and -215° Coterminal Angles

Illustration showing coterminal angles of 145° and -215°. Coterminal angles are angles drawn…

Illustration showing coterminal angles of 150° and -210°. Coterminal angles are angles drawn in standard position that have a common terminal side. In this illustration, both angles are labeled with the proper degree measure.

150° and -210° Coterminal Angles

Illustration showing coterminal angles of 150° and -210°. Coterminal angles are angles drawn…

Illustration showing coterminal angles of 155° and -205°. Coterminal angles are angles drawn in standard position that have a common terminal side. In this illustration, both angles are labeled with the proper degree measure.

155° and -205° Coterminal Angles

Illustration showing coterminal angles of 155° and -205°. Coterminal angles are angles drawn…

Illustration showing coterminal angles of 160° and -200°. Coterminal angles are angles drawn in standard position that have a common terminal side. In this illustration, both angles are labeled with the proper degree measure.

160° and -200° Coterminal Angles

Illustration showing coterminal angles of 160° and -200°. Coterminal angles are angles drawn…

Illustration showing coterminal angles of 165° and -195°. Coterminal angles are angles drawn in standard position that have a common terminal side. In this illustration, both angles are labeled with the proper degree measure.

165° and -195° Coterminal Angles

Illustration showing coterminal angles of 165° and -195°. Coterminal angles are angles drawn…

Illustration showing coterminal angles of 170° and -190°. Coterminal angles are angles drawn in standard position that have a common terminal side. In this illustration, both angles are labeled with the proper degree measure.

170° and -190° Coterminal Angles

Illustration showing coterminal angles of 170° and -190°. Coterminal angles are angles drawn…

Illustration showing coterminal angles of 175° and -185°. Coterminal angles are angles drawn in standard position that have a common terminal side. In this illustration, both angles are labeled with the proper degree measure.

175° and -185° Coterminal Angles

Illustration showing coterminal angles of 175° and -185°. Coterminal angles are angles drawn…

Illustration showing coterminal angles of 180° and -180°. Coterminal angles are angles drawn in standard position that have a common terminal side. In this illustration, both angles are labeled with the proper degree measure.

180° and -180° Coterminal Angles

Illustration showing coterminal angles of 180° and -180°. Coterminal angles are angles drawn…

Illustration showing coterminal angles of 185° and -175°. Coterminal angles are angles drawn in standard position that have a common terminal side. In this illustration, both angles are labeled with the proper degree measure.

185° and -175° Coterminal Angles

Illustration showing coterminal angles of 185° and -175°. Coterminal angles are angles drawn…

Illustration showing coterminal angles of 190° and -170°. Coterminal angles are angles drawn in standard position that have a common terminal side. In this illustration, both angles are labeled with the proper degree measure.

190° and -170° Coterminal Angles

Illustration showing coterminal angles of 190° and -170°. Coterminal angles are angles drawn…

Illustration showing coterminal angles of 195° and -165°. Coterminal angles are angles drawn in standard position that have a common terminal side. In this illustration, both angles are labeled with the proper degree measure.

195° and -165° Coterminal Angles

Illustration showing coterminal angles of 195° and -165°. Coterminal angles are angles drawn…

Illustration showing coterminal angles of 200° and -160°. Coterminal angles are angles drawn in standard position that have a common terminal side. In this illustration, both angles are labeled with the proper degree measure.

200° and -160° Coterminal Angles

Illustration showing coterminal angles of 200° and -160°. Coterminal angles are angles drawn…

Illustration showing coterminal angles of 205° and -155°. Coterminal angles are angles drawn in standard position that have a common terminal side. In this illustration, both angles are labeled with the proper degree measure.

205° and -155° Coterminal Angles

Illustration showing coterminal angles of 205° and -155°. Coterminal angles are angles drawn…

Illustration showing coterminal angles of 210° and -150°. Coterminal angles are angles drawn in standard position that have a common terminal side. In this illustration, both angles are labeled with the proper degree measure.

210° and -150° Coterminal Angles

Illustration showing coterminal angles of 210° and -150°. Coterminal angles are angles drawn…

Illustration showing coterminal angles of 215° and -145°. Coterminal angles are angles drawn in standard position that have a common terminal side. In this illustration, both angles are labeled with the proper degree measure.

215° and -145° Coterminal Angles

Illustration showing coterminal angles of 215° and -145°. Coterminal angles are angles drawn…