 ### Perpendicular Bisectors In A Triangle

Illustration used to prove "The perpendicular bisectors of the sides of a triangle are concurrent in… ### Perpendiculars Dropped Any Point in the Equilateral Triangle

Illustration to show the perpendiculars dropped from any point in the equilateral triangle to the three… ### Perpendiculars Dropped From Midpoint of Base to Legs of Isosceles Triangles

Illustration to show the perpendiculars dropped from the midpoint of the base to the legs of an isosceles… ### Point in Base of Isosceles Triangle

Illustration to show that the difference of the distances from any point in the base produced of an… ### Trigonometric Reference Triangles/Angles (60 degrees) Drawn in Quadrants

Trigonometric reference triangles/angles drawn for 60 degree reference angel in quadrants I and II. ### Right Triangle

Illustration showing a right triangle (one that has one right angle). ### Inclined Plane Forming Right Triangle

Inclined plane forming right triangle showing the velocity of a body sliding a distance,s, down a smooth… ### Right Triangle With Sides .7 and 1 and Angle of 35 degrees

Right triangle OQP with angle of 35 degrees, height of .70 inches, and leg of 1 inch. ### Right Triangle With Sides .64 and 1 and Angle of 40 degrees

Right triangle OQP with angle of 40 degrees, height of .64 inches, and hypotenuse of 1 inch. ### Right Triangle ABC With Angle 67 degrees 42.8 minutes and Hypotenuse 23.47 ft.

Right triangle ABC with a base angle of 67 degrees 4208 minutes and a hypotenuse of 23.47 ft. ### Right Triangle ABC With Leg 23.85 ft. and Hypotenuse 35.62 ft.

Right triangle ABC with a leg of 23.85 feet and a hypotenuse of 35.62 feet. ### Right Triangle With One Angle Double the Other

Illustration of a right triangle with one angle the double of the other. ### Triangle With Segment Extended for Exterior Angle

Illustration showing a triangle with an exterior segment drawn to show and exterior angle. This can… ### Triangle With Interior Segment

Illustration showing a triangle with an interior segment drawn ### Special Right Triangle with Angles 30, 60, 90 degrees

Special right triangle with angles 30 degrees, 60 degrees, and 90 degrees with side measures/relationships… ### Special Right Triangle with Angles 45, 45, 90 degrees

Special right triangle with angles 45 degrees, 45 degrees, and 90 degrees with side measures/relationships… ### Triangle With Interior Segment Drawn

Illustration showing a triangle with a segment inside. ### Equal Triangles

Illustration showing two equal triangles. ### Equal Triangles by Side Side Side

Illustration showing two equal triangles. This can be used to show that two triangles are equal if the… ### Proof of Equal Triangles Drawing

Illustration to show if two triangles have two sides of the one equal, respectively, to two sides of… ### Trigonometric Reference Triangles/Angles Drawn in Quadrants

Trigonometric reference triangles/angles drawn for reference angel in quadrants I and II. This illustration… ### Equal Right Triangles by Hypotenuse Leg

Illustration showing two equal right triangles. This can be used to show that two right triangles are… ### Three Triangles Used to Compare Sides

Illustration showing three triangles. This is used to show the following theorem: If two triangles have… ### Triangular City Block With Angles and Lengths

Illustration showing an angle of 23 degrees 40 minutes making a triangle in a city block and marking… ### Arcs and Angles of a Trigonometric Circle

"In trigonometry, the arcs of circles are used to measure angles. All angles are supposed to have their… ### Trigonometry Triangle to Show Sine, Cosine, and Tangent

Right triangle OCA, inside of Circle O is used to show that side AC is "opposite" O and side OC is "adjacent"… ### Wire at Right Angle to the Uniting Wire

"Direction of the needle when placed at a right angle to the uniting wire." -Comstock 1850 ### Vector

OP is a line representing a vector (directed quantity) ### Vector Showing Force at Angle of 20 degrees

OP is a vector (directed quantity) showing the force by a weight acting on it at an angle of 20 degrees. ### Visual Angle

"Suppose the object a, appears to the naked eye of the length repreesnted in the drawing. Now, as the… ### Wrenches

"1, Screw-wrench; 2, Tap-wrench; 3, Angle-wrench; 4, Tube-wrench; 5, Monkey-wrench for hexagonal and…