Angle Relationships

Front

What are supplementary angles?

Back

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

Front

If ∠A is 120°, what is the measure of its supplementary angle ∠B?

Back

∠B = 60°

Front

What are complementary angles?

Back

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

Front

If ∠C is 30°, what is the measure of its complementary angle ∠D?

Back

∠D = 60°

Front

What are vertical angles?

Back

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

Front

If ∠1 and ∠3 are vertical angles, and ∠1 = 45°, what is ∠3?

Back

∠3 = 45°

Front

What are adjacent angles?

Back

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

Front

If ∠E is 70° and is adjacent to ∠F, what is the measure of ∠F if they are supplementary?

Back

∠F = 110°

Front

What is the sum of the angles in a triangle?

Back

The sum of the angles in a triangle is always 180 degrees.

Front

If one angle in a triangle is 90° and another is 45°, what is the measure of the third angle?

Back

The third angle = 45°.