Supplementary, Complementary and Vertical Angles

Front

What are supplementary angles?

Back

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

Front

What are complementary angles?

Back

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

Front

What are vertical angles?

Back

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

Front

If one angle is 70 degrees, what is its supplementary angle?

Back

110 degrees (180 - 70 = 110).

Front

If one angle is 30 degrees, what is its complementary angle?

Back

60 degrees (90 - 30 = 60).

Front

Find the value of x if x + 70 = 180.

Back

x = 110 degrees.

Front

Find the value of x if x + 20 = 90.

Back

x = 70 degrees.

Front

If ∠1 and ∠2 are vertical angles and ∠1 = 45 degrees, what is ∠2?

Back

∠2 = 45 degrees.

Front

If ∠A and ∠B are supplementary and ∠A = 135 degrees, what is ∠B?

Back

∠B = 45 degrees (180 - 135 = 45).

Front

If ∠C and ∠D are complementary and ∠C = 25 degrees, what is ∠D?

Back

∠D = 65 degrees (90 - 25 = 65).