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.

### Construction of Geometric Revolution

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

### Revolutions into the Plane of Geometric Shapes

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

### Successive Revolutions of Geometric Shapes

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

### 2 Ladders Leaning Against a Tree

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

### 3 Ladders Leaning Against a Wall

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

### Lever and Fulcrum

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

### Hammer Used as a Lever

Illustration of a hammer being used as a lever. F represents the fulcrum.

### Steel-yard Used as a Lever

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

### Parallel Lines Cut by Transversals

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

### Parallel Lines Cut by Transversals

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

### Measuring Tree Height

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

### Similar Pentagons

Illustration of 2 similar pentagons.

### Similar Pentagons

Illustration of 2 similar pentagons.

### Similar Polygons (Pentagons) That Can Be Used To Show Proportionality

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

### Similar Polygons (Pentagons) That Can Be Used To Show Proportionality

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

### Hydraulic Machine Exerting Pressure

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

### Triangle Pyramid Side Projections

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

### Angle Bisector of Triangle Dividing Opposite Side Into Proportionate Segments

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

### Exterior Angle Bisector of Triangle Dividing Opposite Side Into Proportionate Segments

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

### Parallel Lines Cut by Parallels, Corresponding Intercepts Proportional

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

### Triangle Divided by Parallel Lines to Form Proportionate Triangles

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

### Triangle Divided by Parallel Lines to Form Proportionate Triangles

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

### Revolution About Axis Forward or Back

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

### Revolution About Axis Perpendicular to H

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

### Revolution About Axis Perpendicular to V

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

### Palm Tree Perpendicular to Ground

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

### Using Proportions To Find Heights of Trees

Triangle diagram for measuring heights of trees using proportions.

### Using Proportions To Find Heights of Trees

Triangle diagram for measuring heights of trees using proportions

### Right Triangle Inscribed in Semicircle Shows Mean Proportional

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

### Mutually Equiangular Similar Triangles

Illustration that shows two mutually equiangular triangles are similar.

### Similar Triangles With Respective Sides Parallel or Perpendicular

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

### Similar triangles

Illustration of 2 similar triangles with altitudes drawn.

### Similar Triangles

Illustration of two similar triangles, abc and ABC.

### Similar Triangles

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

### Similar Triangles for Distance Across Lake

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

### Similar Triangles for Distance Across Stream

Illustration of similar triangles used to find distance across a stream

### Similar Triangles for Height of Smokestack

Illustration of similar triangles used to find height of smokestack.

### Similar Triangles With Altitudes Drawn

Illustration that shows two similar triangles with altitudes drawn.