Theorems Of Perpendicular Lines

Theorem 3.4: If two sides of adjacent acute angles are perpendicular, then the angles are complementary.

Theorem 3.3: If two lines intersect to form adjacent congruent angles ,then the lines are perpendicular.

Theorem 3.2: If two lines are perpendicular, then they intersect to form 4 right angles.

Theorem 3.1: All right angles are congruent.