501 Geometry Questions

When a transversal is perpendicular to a pair of parallel lines, all eight
angles are congruent.

There are also exterior angles, same-side exterior angles, and alter-
nate exterior angles. They are positioned by the same common-sense
rules as the interior angles.
Two lines are parallel if any one of the following statements is true:

1. A pair of alternate interior angles is congruent.


2. A pair of alternate exterior angles is congruent.


3. A pair of corresponding angles is congruent.


4. A pair of same-side interior angles is supplementary.

1 2

4 3

5 6

8 7

∠ 1  ∠ 2  ∠ 3  ∠ 4

∠ 5  ∠ 6  ∠ 7  ∠ 8

m∠1 = m∠2 = m∠3 = m∠ 4

m∠5 = m∠6 = m∠ 7

m∠8 = 90

501 Geometry Questions