This mathematics ClipArt gallery offers 38 illustrations that can be used when teaching the concept of proportionality. A proportion is an equation stating that two ratios are equal. Images are of similar figures, including those that can be used in application problems.

"The distance of A and B below H is indicated on the V projection. Thus if to A∧h B∧h the perpendiculars…

"The H projection of the line AB in the space is a line connecting the feet of all the perpendiculars…

"A block revolved from its first position about an axis perpendicular to H through 45 degrees, then…

Illustration of 2 ladders leaning against opposite sides of a palm tree to form similar right triangles.…

Illustration of 3 ladders leaning against the side of a building (wall) to form right triangles. The…

Illustration of a lever with fulcrum F. W represents the weight lifted, P is the force that does the…

Illustration of an ordinary steel-yard being used as a lever. F represents the fulcrum. Weight P is…

Illustration that shows if two parallel lines are cut by three or more transversals that pass through…

Illustration that shows if two parallel lines are cut by three or more transversals that pass through…

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

Illustration that shows similar polygons (pentagons) that can be used to show proportionality.

Illustration that shows similar polygons (pentagons) that can be used to show proportionality.

Illustration of a hydraulic machine. "A principle known as Pascal's Law states that pressure exerted…

The illustration showing the projection of the triangles from the triangle pyramid as shown on top.…

Illustration to show that an angle bisector of a triangle divides the opposite side into segments which…

Illustration to show that a bisector of a an exterior angle of a triangle divides the opposite side…

Illustration to show that if parallel lines are cut by any number of parallels, the corresponding intercepts…

Illustration to show that if a line is drawn through two sides of a triangle parallel to the third side,…

Illustration to show that if a line divides two sides of a triangle proportionally, it is parallel to…

"The pyramid be revolved about an axis perpendicular to V, the front view will be unchanged and may…

The object can revolve around an axis (H) to create a projection on the other plane without changing…

"The pyramid be revolved about an axis perpendicular to V, the front view will be unchanged and may…

Illustration of a palm tree that is perpendicular to the ground. The tree is perfectly straight, as…

Triangle diagram for measuring heights of trees using proportions.

Triangle diagram for measuring heights of trees using proportions

Right triangle inscribed in semicircle. Illustration shows that the perpendicular from any point in…

Illustration that shows two mutually equiangular triangles are similar.

Illustration that shows that two triangles which have their sides respectively parallel, or respectively…

Illustration of a triangle divided by a parallel line to form two similar triangles.

Illustration of similar triangles used to find distance across a lake.

Illustration of similar triangles used to find distance across a stream

Illustration of similar triangles used to find height of smokestack.

Illustration that shows two similar triangles with altitudes drawn.