Geometry Parallel Lines & Transversals

Question 1

When two parallel lines are cut by a transversal, alternate interior angles are _____.

Accepted Answer

equal

Answer

Alternate interior angles are congruent (equal) when the lines cut by the transversal are parallel.

Question 2

Co-interior angles (same-side interior angles) formed by two parallel lines and a transversal sum to _____.

Accepted Answer

180°

Answer

Co-interior (consecutive interior) angles are supplementary, always summing to 180° when the lines are parallel.

Question 3

Corresponding angles formed when a transversal cuts two parallel lines are _____.

Accepted Answer

congruent

Answer

Corresponding angles occupy the same relative position at each intersection and are equal when lines are parallel.

Question 4

When a transversal intersects two parallel lines, how many pairs of corresponding angles are formed?

Accepted Answer

4

Answer

The transversal creates 4 angles at each of the 2 intersections (8 angles total), forming exactly 4 pairs of corresponding angles.

Question 5

If one co-interior angle measures 115°, what is the other co-interior angle when the lines are parallel?

Accepted Answer

65°

Answer

Co-interior angles sum to 180°, so the other angle is 180° − 115° = 65°.

Geometry Practice Test