Naming Angles

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 measurement of a right angle?

Back

90 degrees.

Front

What type of angle measures less than 90 degrees?

Back

Acute angle.

Front

What type of angle measures more than 90 degrees but less than 180 degrees?

Back

Obtuse angle.

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

How do you denote an angle using three points?

Back

An angle can be denoted as angle ABC, where A and C are points on the rays and B is the vertex.

Front

What is the symbol used to represent an angle?

Back

The symbol for an angle is ∠.

Front

What is a complementary angle?

Back

Two angles are complementary if the sum of their measures is 90 degrees.

Front

What is a supplementary angle?

Back

Two angles are supplementary if the sum of their measures is 180 degrees.

Front

How do you name an angle formed by two intersecting lines?

Back

You can name the angle using the vertex and a point from each ray, e.g., ∠ABC.