3.4

Question 1

Theorem 3.3

Answer 1

If two lines are perpendicular, then they intersect to form four right angles.

Question 2

Theorem 3.4

Answer 2

All right angles are congruent.

Question 3

Theorem 3.5

Answer 3

If two lines intersect to form a pair of adjacent congruent angles, then the lines are perpendicular.