Straight lines, parallel lines, perpendicular lines.
By: Illustrated by Enrico Arno.
Contributors: Arno, Enrico, illus.
Series: Young math books
Publisher: Crowell
Published: 1970
Place of publication: New York
Language: eng
Number of pages: 33
Subjects: Geometry -- Juvenile literature.; Geometry.
Description: 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.