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

LESSON EIGHTH.

REVIEW.

Read the pairs of adjacent angles above the line a b. (Diagram [8].)

Why are they adjacent?

What are adjacent angles?

Read the adjacent angles below the line a b.

On the right of the line c d. On the left.

How many pairs of adjacent angles are formed by the intersection of two lines.

Read the pairs of adjacent angles formed by the lines f g and i h.

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

Read all the pairs of vertical angles formed by the lines a b, c d.

Why are c e b and a e d called vertical angles?

What are vertical angles?

Read all the pairs of vertical angles formed by the lines h i, f g.

How many pairs of vertical angles are formed by the intersection of two lines?

Read all the pairs of vertical angles formed by the lines l m, n p.