An illustration of a circle inscribed in a square. It can be used to show that the area of a circle…

Illustration of a square constructed upon the sum of two straight lines.

Illustration of a square constructed upon the difference of two straight lines.

Illustration of a square constructed upon the difference of two straight lines.

Illustration of a how to construct a square equivalent to the sum of two given squares.

Illustration of a how to construct a square equivalent to the difference of two given squares.

Illustration used to construct a square that shall be a multiple of any given square.

Illustration used to construct a square that shall be in proportion to a given square.

Illustration used to construct a square that shall be in proportion to a given square.

Illustration of a square inscribed in a square. The interior square is rotated 45° in relation to…

Illustrations of a square with diagonal DB, BE cut off equal to BC, and EF drawn perpendicular to BD…

Illustration showing a square with diagonals, lines, and parallel lines

Illustration of 2 concentric squares whose vertices are connected by line segments.

Two set squares, whose sides are 3,4, and 5 in., are placed so that their 4-in. sides and right angles…

A problem exercise to creating a star using series of triangles and squares. The image is divided by…

Illustration of a square inscribed in a square that is inscribed in another square. Each successive…

Illustration of a square inscribed in a square that is inscribed in another square. Each successive…

Illustration of a square inscribed in a square that is inscribed in another square. Each successive…

Tangrams, invented by the Chinese, are used to develop geometric thinking and spatial sense. Seven figures…

Tangrams, invented by the Chinese, are used to develop geometric thinking and spatial sense. Seven figures…

Tangrams, invented by the Chinese, are used to develop geometric thinking and spatial sense. Seven figures…

"An exercise in starting and stopping short lines. Draw three-inch square. Draw diagonals with 45-degree…

Outlines of animals (bear, kangaroo, camel, giraffe) made from tangram pieces. Tangrams, invented by…

Outlines of animals (fox, rabbit, cat) made from tangram pieces. Tangrams, invented by the Chinese,…

Solutions for outlines of animals (bear, kangaroo, camel, giraffe) made from tangram pieces. Tangrams,…

Solutions for outlines of animals (fox, rabbit, cat) made from tangram pieces. Tangrams, invented by…

Silhouette outlines of animals (bear, kangaroo, camel, giraffe) made from tangram pieces. Tangrams,…

Silhouette outlines of animals (fox, rabbit, cat) made from tangram pieces. Tangrams, invented by the…

Solutions for silhouette outlines of animals (bear, kangaroo, camel, giraffe) made from tangram pieces.…

Solutions for silhouette outlines of animals (fox, rabbit, cat) made from tangram pieces. Tangrams,…

Outlines of birds (duck, swan, turkey vulture, cormorant, and egret) made from tangram pieces. Tangrams,…

Solutions for outlines of birds (duck, swan, turkey vulture, cormorant, and egret) made from tangram…

Silhouette outlines of birds (duck, swan, turkey vulture, cormorant, and egret) made from tangram pieces.…

Solutions for silhouette outlines of birds (duck, swan, turkey vulture, cormorant, and egret) made from…

Outlines of boats (sailboat, ship, yacht) made from tangram pieces. Tangrams, invented by the Chinese,…

Solutions for outlines of boats (sailboat, ship, yacht) made from tangram pieces. Tangrams, invented…

Silhouette outlines of boats (sailboat, ship, yacht) made from tangram pieces. Tangrams, invented by…