Finding Missing Angle Measures

Front

What is the measure of the following angle?

Back

10 degrees.

Front

∠1 and ∠3 can best be described as -

Back

vertical angles

Front

What are complementary angles?

Back

Angles that add up to 90°.

Front

If m∠1 = 30°, then m∠3 =

Back

30°.

Front

What are supplementary angles?

Back

Angles that add up to 180°.

Front

What is the sum of angles in a triangle?

Back

180°.

Front

What are adjacent angles?

Back

Angles that share a common side and vertex.

Front

What are vertical angles?

Back

Angles that are opposite each other when two lines intersect.

Front

If two angles are complementary, what is their sum?

Back

90°.

Front

If two angles are supplementary, what is their sum?

Back

180°.