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

The angles c e b, b e d are both on the same side of what straight line?

They are both formed by what second straight line?

Then what kind of angles are they?

Why are they called adjacent angles?

Read the adjacent angles below the line a b. Below the line c d.

How many pairs of adjacent angles can be formed by two straight lines?

Read all the adjacent angles formed by the lines l m and n p.

VERTICAL ANGLES.

Are the angles a e c, b e d formed by the same straight lines?

Are they adjacent angles?