Equivalent angles in Circles

CONCEPTS

Radians vs Degrees

• Radians = 180° / π * Degrees

Equivalent Angles

• Angles in multiples of 360° or 2π are equal (ex: 10° = 370° = -350°)

PRACTICE PROBLEMS

Question 1 Angle A measures 9/2 π radians from its initial side to its terminal side. Angle B has the same initial and terminal side as Angle A. What is a measure of Agnle B less than 360°?

-- Answer -- 90°

9/2 π = 1/2 π + 4 π

1/2 π = 90°

ACT PRACTICE PROBLEMS