Measuring, adding and subtracting angles

Front

What is an angle?

Back

An angle is formed by two rays (sides) that meet at a point called the 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

How do you measure an angle?

Back

You can measure an angle using a protractor.

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 complementary angles?

Back

Complementary angles are two angles that add up to 90 degrees.

Front

What is supplementary angles?

Back

Supplementary angles are two angles that add up to 180 degrees.