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

What is a right angle?

Read four right angles whose vertices are at n.

Which is the greater, the right angle p q r, or the right angle t s u?

Can one right angle be greater than another?

Read six acute angles whose vertices are at n.

Why is m n g an acute angle?

What is an acute angle?

Which is greater, the acute angle m n g, or the acute angle l n m?

May one acute angle be greater than another?

What three acute angles are equal to one right angle?