Complimentary, Supplementary, Vertical Angles

Front

What are vertical angles?

Back

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

Front

What are complementary angles?

Back

Complementary angles are two angles that add up to 90°.

Front

What are supplementary angles?

Back

Supplementary angles are two angles that add up to 180°.

Front

If ∠A and ∠B are complementary, and ∠A = 30°, what is ∠B?

Back

∠B = 60° (because 90° - 30° = 60°).

Front

If ∠C and ∠D are supplementary, and ∠C = 110°, what is ∠D?

Back

∠D = 70° (because 180° - 110° = 70°).

Front

Identify the relationship: ∠1 and ∠2 are adjacent and add up to 180°.

Back

They are supplementary angles.

Front

Identify the relationship: ∠3 and ∠4 are equal and opposite when two lines intersect.

Back

They are vertical angles.

Front

If two angles are complementary and one angle measures 45°, what is the measure of the other angle?

Back

The other angle measures 45° (because 90° - 45° = 45°).

Front

If ∠X and ∠Y are vertical angles, and ∠X = 40°, what is ∠Y?

Back

∠Y = 40° (because vertical angles are equal).

Front

What is the sum of the measures of two supplementary angles?

Back

The sum is 180°.