Finding Missing Angles

Front

What is an angle?

Back

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

Front

What is a right angle?

Back

A right angle measures exactly 90 degrees.

Front

What is an acute angle?

Back

An acute angle is an angle that measures less than 90 degrees.

Front

What is an obtuse angle?

Back

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

Front

How do you find a missing angle in a triangle?

Back

To find a missing angle in a triangle, subtract the sum of the known angles from 180 degrees.

Front

What is the sum of angles in a triangle?

Back

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

Front

What is a straight angle?

Back

A straight angle measures exactly 180 degrees.

Front

What is a full rotation?

Back

A full rotation is 360 degrees.

Front

If one angle measures 40 degrees, what is the measure of its complement?

Back

The complement of an angle is found by subtracting it from 90 degrees. So, 90 - 40 = 50 degrees.

Front

If one angle measures 70 degrees, what is the measure of its supplement?

Back

The supplement of an angle is found by subtracting it from 180 degrees. So, 180 - 70 = 110 degrees.