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 are vertical angles?

Why is m o i an exterior angle?

What is an exterior angle?

Why is j o p an interior angle?

What is an interior angle?

Why are m o i, o p k, opposite angles?

What are opposite angles?

Why are j o p, o p k, alternate angles?

What are alternate angles?