Marks' first lessons in geometry / In two parts. Objectively presented, and designed for the use of primary classes in grammar schools, academies, etc.

by Bernhard Marks

How many?

It is called a “rectangle.”

A rectangle is a right-angled parallelogram.

Name four other rectangles.

What three names may be given to Fig. i l?

Why a quadrilateral? Why a parallelogram? Why a rectangle?

SQUARES.

Has the rectangle i l its four sides equal?

Has the rectangle m p its four sides equal?

It is called a “square.”