geometry, plane

Explains the principles of plane geometry and includes practice exercises, answers, and model problems.

Explains the principles of plane geometry and includes practice exercises, answers, and model problems.

Tells the story of phi, the never ending, never repeating number known as the Golden Ratio, written as 1.6180339887..., looking at how it has been used, and claims about its use, throughout the history of mathematics.

Photographs and simple text describe various objects that are shaped like triangles.

Photographs and simple text describe various objects that are shaped like squares.

Photographs and simple text describe various objects that are shaped like rectangles.

Photographs and simple text describe various objects that are shaped like ovals.

Simple text and photographs show where ovals can be found around a city.