8.2: Special Right Triangles, Reference & Coterminal Angles

8.2: Special Right Triangles, Reference & Coterminal Angles

Objective: Know the relationships in special right triangles and understand reference and coterminal angle definitions.

Special Right Triangles

• 45-45-90 Right Triangle

• 30-60-90 Right Triangle

Special Right Triangle

Multiple Choice

Find x.

• 10

• √3

• 5

• 10√3

Reference Angle

• A reference angle is a positive, acute angle that measures the distance from the terminal side to the closest x-axis.

How to find Reference Angles

Reference Angle Example

Coterminal Angle

How to Find Coterminal Angles

Coterminal Angle Example

Coterminal Angle Example