Measuring Angles

Front

What is an angle?

Back

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

Front

What is the unit of measurement for angles?

Back

Angles are 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 measures less than 90 degrees.

Front

What is an obtuse angle?

Back

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

Front

What is a straight angle?

Back

A straight angle measures exactly 180 degrees.

Front

What is a full rotation in degrees?

Back

A full rotation around a point measures 360 degrees.

Front

How do you measure an angle using a protractor?

Back

Align the protractor's center point with the angle's vertex and read the measurement where one ray crosses the protractor's scale.

Front

What is the sum of angles in a triangle?

Back

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

Front

What is a complementary angle?

Back

Two angles are complementary if their measures add up to 90 degrees.