Naming Angles

Front

What is an angle?

Back

An angle is formed by two rays (sides of the angle) that share a common endpoint (the 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 measurement?

Back

Types of angles include acute (less than 90°), right (exactly 90°), obtuse (greater than 90° but less than 180°), straight (exactly 180°), and reflex (greater than 180°).

Front

How do you name an angle using its vertex?

Back

An angle can be named using its vertex and a point on each ray, for example, ∠ABC where B is the vertex.

Front

What does it mean for angles to be congruent?

Back

Congruent angles are angles that have the same measure.

Front

How can you identify an angle in a diagram?

Back

Angles are often marked with a small arc or a number indicating their measure.

Front

What is the relationship between complementary angles?

Back

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

Front

What is the relationship between supplementary angles?

Back

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

Front

How do you find the measure of an unknown angle if you know one angle in a pair of complementary angles?

Back

Subtract the known angle from 90° to find the measure of the unknown angle.

Front

How do you find the measure of an unknown angle if you know one angle in a pair of supplementary angles?

Back

Subtract the known angle from 180° to find the measure of the unknown angle.