Finding Missing Angles

Front

What is an angle?

Back

An angle is formed by two rays (sides) that share a common endpoint (vertex).

Front

What is a right angle?

Back

A right angle measures 90 degrees.

Tags

CCSS.4.G.A.1

Front

What is an acute angle?

Back

An acute angle measures less than 90 degrees.

Tags

CCSS.4.G.A.1

Front

What is an obtuse angle?

Back

An obtuse angle measures more than 90 degrees but less than 180 degrees.

Tags

CCSS.4.G.A.1

Front

What is a straight angle?

Back

A straight angle measures exactly 180 degrees.

Tags

CCSS.4.G.A.1

Front

How do you find a missing angle in a triangle?

Back

The sum of the angles in a triangle is always 180 degrees. Subtract the known angles from 180 to find the missing angle.

Tags

CCSS.8.G.A.5

Front

What is the sum of angles in a quadrilateral?

Back

The sum of the angles in a quadrilateral is always 360 degrees.

Tags

CCSS.HSG.C.A.3

Front

If one angle measures 50 degrees, what is the measurement of the other angle if they are complementary?

Back

The other angle measures 40 degrees (90 - 50 = 40).

Tags

CCSS.7.G.B.5

Front

If two angles are supplementary and one measures 120 degrees, what is the measurement of the other angle?

Back

The other angle measures 60 degrees (180 - 120 = 60).

Tags

CCSS.7.G.B.5

Front

What is a complementary angle?

Back

Two angles are complementary if their sum is 90 degrees.

Tags

CCSS.7.G.B.5