Measuring Angles and Find the Missing Angle

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 the total measure of angles in a quadrilateral?

Back

The total measure of angles in a quadrilateral is 360 degrees.

Front

What is a right angle?

Back

A right angle measures 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 the missing angle in a triangle?

Back

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

Front

If one angle in a triangle measures 60 degrees and another measures 50 degrees, what is the measure of the third angle?

Back

The third angle measures 70 degrees (180 - 60 - 50 = 70).

Front

What is the measure of a straight angle?

Back

A straight angle measures 180 degrees.

Front

What is the relationship between complementary angles?

Back

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

Front

What is the relationship between supplementary angles?

Back

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