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?

Back

The different types of angles are acute (less than 90°), right (exactly 90°), obtuse (greater than 90° but less than 180°), straight (exactly 180°), and reflex (greater than 180°).

Front

What is a right angle?

Back

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

Front

What is a supplementary angle?

Back

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

Front

What is a complementary angle?

Back

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

Front

If one angle measures 110°, what is the measure of its supplementary angle?

Back

70° (because 180° - 110° = 70°).

Front

If ∠BAD = 110°, what is the measure of ∠CAD if they are supplementary?

Back

70° (because 180° - 110° = 70°).

Front

What is the measure of an angle that is complementary to a 60° angle?

Back

30° (because 90° - 60° = 30°).

Front

What is the sum of angles in a triangle?

Back

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