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An isosceles triangle with angles 149, 15.5, 15.5

Isosceles Triangle degrees 149, 15.5, 15.5

An isosceles triangle with angles 149, 15.5, 15.5

An isosceles triangle with angles 150, 15, 15

Isosceles Triangle degrees 150, 15, 15

An isosceles triangle with angles 150, 15, 15

An isosceles triangle with angles 151, 14.5, 14.5

Isosceles Triangle degrees 151, 14.5, 14.5

An isosceles triangle with angles 151, 14.5, 14.5

An isosceles triangle with angles 152, 14, 14

Isosceles Triangle degrees 152, 14, 14

An isosceles triangle with angles 152, 14, 14

An isosceles triangle with angles 153, 13.5, 13.5

Isosceles Triangle degrees 153, 13.5, 13.5

An isosceles triangle with angles 153, 13.5, 13.5

An isosceles triangle with angles 154, 13, 13

Isosceles Triangle degrees 154, 13, 13

An isosceles triangle with angles 154, 13, 13

An isosceles triangle with angles 155, 12.5, 12.5

Isosceles Triangle degrees 155, 12.5, 12.5

An isosceles triangle with angles 155, 12.5, 12.5

An isosceles triangle with angles 156, 12, 12

Isosceles Triangle degrees 156, 12, 12

An isosceles triangle with angles 156, 12, 12

An isosceles triangle with angles 157, 11.5, 11.5

Isosceles Triangle degrees 157, 11.5, 11.5

An isosceles triangle with angles 157, 11.5, 11.5

An isosceles triangle with angles 158, 11, 11

Isosceles Triangle degrees 158, 11, 11

An isosceles triangle with angles 158, 11, 11

An isosceles triangle with angles 159, 10.5, 10.5

Isosceles Triangle degrees 159, 10.5, 10.5

An isosceles triangle with angles 159, 10.5, 10.5

An isosceles triangle with angles 160, 10, 10

Isosceles Triangle degrees 160, 10, 10

An isosceles triangle with angles 160, 10, 10

An isosceles triangle with angles 161, 9.5, 9.5

Isosceles Triangle degrees 161, 9.5, 9.5

An isosceles triangle with angles 161, 9.5, 9.5

An isosceles triangle with angles 162, 9, 9

Isosceles Triangle degrees 162, 9, 9

An isosceles triangle with angles 162, 9, 9

An isosceles triangle with angles 163, 8.5, 8.5

Isosceles Triangle degrees 163, 8.5, 8.5

An isosceles triangle with angles 163, 8.5, 8.5

An isosceles triangle with angles 164, 8, 8

Isosceles Triangle degrees 164, 8, 8

An isosceles triangle with angles 164, 8, 8

An isosceles triangle with angles 165, 7.5, 7.5

Isosceles Triangle degrees 165, 7.5, 7.5

An isosceles triangle with angles 165, 7.5, 7.5

An isosceles triangle with angles 166, 7, 7

Isosceles Triangle degrees 166, 7, 7

An isosceles triangle with angles 166, 7, 7

An isosceles triangle with angles 167, 6.5, 6.5

Isosceles Triangle degrees 167, 6.5, 6.5

An isosceles triangle with angles 167, 6.5, 6.5

An isosceles triangle with angles 168, 6, 6

Isosceles Triangle degrees 168, 6, 6

An isosceles triangle with angles 168, 6, 6

An isosceles triangle with angles 169, 5.5, 5.5

Isosceles Triangle degrees 169, 5.5, 5.5

An isosceles triangle with angles 169, 5.5, 5.5

An isosceles triangle with angles 170, 5, 5

Isosceles Triangle degrees 170, 5, 5

An isosceles triangle with angles 170, 5, 5

An isosceles triangle with angles 171, 4.5, 4.5

Isosceles Triangle degrees 171, 4.5, 4.5

An isosceles triangle with angles 171, 4.5, 4.5

An isosceles triangle with angles 172, 4, 4

Isosceles Triangle degrees 172, 4, 4

An isosceles triangle with angles 172, 4, 4

An isosceles triangle with angles 173, 3.5, 3.5

Isosceles Triangle degrees 173, 3.5, 3.5

An isosceles triangle with angles 173, 3.5, 3.5

An isosceles triangle with angles 174, 3, 3

Isosceles Triangle degrees 174, 3, 3

An isosceles triangle with angles 174, 3, 3

An isosceles triangle with angles 175, 2.5, 2.5

Isosceles Triangle degrees 175, 2.5, 2.5

An isosceles triangle with angles 175, 2.5, 2.5

An isosceles triangle with angles 176, 2, 2

Isosceles Triangle degrees 176, 2, 2

An isosceles triangle with angles 176, 2, 2

An isosceles triangle with angles 177, 1.5, 1.5

Isosceles Triangle degrees 177, 1.5, 1.5

An isosceles triangle with angles 177, 1.5, 1.5

An isosceles triangle with angles 178, 1, 1

Isosceles Triangle degrees 178, 1, 1

An isosceles triangle with angles 178, 1, 1

An isosceles triangle with angles 179, 0.5, 0.5

Isosceles Triangle degrees 179, 0.5, 0.5

An isosceles triangle with angles 179, 0.5, 0.5

Polygon consisting of 3 sides

3-sided Polygon

Polygon consisting of 3 sides

1/3 of a 3 sided polygon

Fractions of 3-sided Polygon

1/3 of a 3 sided polygon

2/3 of a 3 sided polygon

Fractions of 3-sided Polygon

2/3 of a 3 sided polygon

3/3 of a 3 sided polygon

Fractions of 3-sided Polygon

3/3 of a 3 sided polygon

An illustration showing an angle the is greater than a right angle and less than a straight angle. This is an obtuse angle (solid curved arrow). The angle that is greater than a straight angle and less than two straight angles is called a reflex angle (dashed curved arrow).

Obtuse And Reflex Angles

An illustration showing an angle the is greater than a right angle and less than a straight angle. This…

An illustration showing acute, obtuse, straight, right, and reflex angles.

Acute, Obtuse, Straight, Right, And Reflex Angles

An illustration showing acute, obtuse, straight, right, and reflex angles.

Illustration of two straight lines drawn from a point in a perpendicular to a given line, cutting off on the given line equal segments from the foot of the perpendicular, are equal and make equal angles with the perpendicular. This illustration can be used to show the proof.

Lines Drawn to Another Line to Form Triangle

Illustration of two straight lines drawn from a point in a perpendicular to a given line, cutting off…

Illustration showing a triangle with an interior segment drawn

Triangle With Interior Segment

Illustration showing a triangle with an interior segment drawn

Illustration showing a triangle with an exterior segment drawn to show and exterior angle. This can be shown to show adjacent angles ACB and ACD as well.

Triangle With Segment Extended for Exterior Angle

Illustration showing a triangle with an exterior segment drawn to show and exterior angle. This can…

Illustration showing a scalene triangle (one that has no two sides equal).

Scalene Triangle

Illustration showing a scalene triangle (one that has no two sides equal).

Illustration showing an isosceles triangle (one that has two sides equal).

Isosceles Triangle

Illustration showing an isosceles triangle (one that has two sides equal).

Illustration showing an equilateral triangle (one that has three sides equal).

Equilateral Triangle

Illustration showing an equilateral triangle (one that has three sides equal).

Illustration showing a right triangle (one that has one right angle).

Right Triangle

Illustration showing a right triangle (one that has one right angle).

Illustration showing an obtuse triangle (one that has one obtuse angle).

Obtuse Triangle

Illustration showing an obtuse triangle (one that has one obtuse angle).

Illustration showing an acute triangle (one that has all three angles that are acute).

Acute Triangle

Illustration showing an acute triangle (one that has all three angles that are acute).

Illustration showing an equiangular triangle (one that has all three angles that are equal).

Equiangular Triangle

Illustration showing an equiangular triangle (one that has all three angles that are equal).

Illustration showing a triangle with exterior angles. This can be used to show the sum of the three angles of a triangle is equal to two right angles.

Triangle with Exterior Angles Drawn

Illustration showing a triangle with exterior angles. This can be used to show the sum of the three…

Illustration showing a triangle with angles A, B, and C labeled.

Triangle ABC

Illustration showing a triangle with angles A, B, and C labeled.

Illustration showing two equal triangles.

Equal Triangles

Illustration showing two equal triangles.

Illustration showing an isosceles triangle with a segment inside. This can be used to show that in an isosceles triangle the angles opposite the equal sides are equal.

Isosceles Triangle With Interior Segment Drawn

Illustration showing an isosceles triangle with a segment inside. This can be used to show that in an…

Illustration showing two equal triangles. This can be used to show that two triangles are equal if the three sides of the one are equal, respectively, to the three sides of the other.

Equal Triangles by Side Side Side

Illustration showing two equal triangles. This can be used to show that two triangles are equal if the…

Illustration showing two equal right triangles. This can be used to show that two right triangles are equal if a leg and the hypotenuse of the one are equal, respectively, to a leg and the hypotenuse of the other.

Equal Right Triangles by Hypotenuse Leg

Illustration showing two equal right triangles. This can be used to show that two right triangles are…

Illustration showing a triangle with a segment inside.

Triangle With Interior Segment Drawn

Illustration showing a triangle with a segment inside.

Illustration showing three triangles. This is used to show the following theorem: If two triangles have two sides of the one equal, respectively, to two sides of the other, but the included angle of the first triangle greater than the included angle of the second, then the third side of the first is greater than the third side of the second.

Three Triangles Used to Compare Sides

Illustration showing three triangles. This is used to show the following theorem: If two triangles have…

Illustration of a triangle showing that when a line parallel to the base of a triangle bisects one side, it bisects the other side also.

Triangle With Bisector Parallel to the Base

Illustration of a triangle showing that when a line parallel to the base of a triangle bisects one side,…

Illustration of a triangle with the median drawn.

Triangle With Median Drawn

Illustration of a triangle with the median drawn.

Illustration of a triangle with a segment parallel to the base.

Triangle With Parallel Segment Drawn

Illustration of a triangle with a segment parallel to the base.

Illustration of a right triangle with the midpoint of the hypotenuse drawn.

Right Triangle With Midpoint of Hypotenuse Drawn

Illustration of a right triangle with the midpoint of the hypotenuse drawn.

Illustration of a right triangle with one angle the double of the other.

Right Triangle With One Angle Double the Other

Illustration of a right triangle with one angle the double of the other.