Straight lines, parallel lines, perpendicular lines /

By making believe there are no straight edges or rulers in the world, the reader learns the geometric principles of straight, parallel, and perpendicular lines.

Bibliographic Details

Main Author:	Charosh, Mannis
Other Authors:	Arno, Enrico
Format:	Book
Language:	English
Published:	New York : Crowell, [1970]
Series:	Young math book.
Subjects:	Geometry > Juvenile literature. Geometry.