Parallel Lines Proofs

Front

What are vertical angles?

Back

Vertical angles are the angles opposite each other when two lines intersect. They are always equal in measure.

Front

What does 'm ll n' signify in geometry?

Back

'm ll n' means that line m is parallel to line n.

Front

What is the Transitive Property?

Back

The Transitive Property states that if A = B and B = C, then A = C.

Front

If two parallel lines are cut by a transversal, what can be said about the alternate interior angles?

Back

The alternate interior angles are equal.

Front

What is the measure of angle 3 if angle 8 measures 100 degrees and lines m and n are parallel?

Back

Angle 3 measures 80 degrees.

Front

Define complementary angles.

Back

Complementary angles are two angles whose measures add up to 90 degrees.

Front

Define supplementary angles.

Back

Supplementary angles are two angles whose measures add up to 180 degrees.

Front

What are adjacent angles?

Back

Adjacent angles are two angles that share a common side and a common vertex.

Front

What is the Symmetric Property?

Back

The Symmetric Property states that if A = B, then B = A.

Front

What is the Reflexive Property?

Back

The Reflexive Property states that any quantity is equal to itself, i.e., A = A.