Measuring and Naming 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 vertex of an angle?

Back

The vertex is the point where the two rays of an angle meet.

Front

What are the different types of angles based on their measures?

Back

1. Acute angle: less than 90° 2. Right angle: exactly 90° 3. Obtuse angle: greater than 90° but less than 180° 4. Straight angle: exactly 180°.

Front

How do you measure an angle?

Back

Angles are measured in degrees (°) using a protractor.

Front

What is an obtuse angle?

Back

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

Front

What is an acute angle?

Back

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

Front

What is a right angle?

Back

A right angle is an angle that measures exactly 90°.

Front

What is a straight angle?

Back

A straight angle is an angle that measures exactly 180°.

Front

What is the sum of angles in a triangle?

Back

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

Front

What is a reflex angle?

Back

A reflex angle is an angle that measures more than 180° but less than 360°.