Radian Unit Circle

What is the measure of the angle shown, in radians?

• π/2

• 3π/4

• 2π/5

• 3π/5

The sine of any angle on the unit circle is the y-coordinate.

• True

• False

Find the arc length.

• 3π/4 ft

• 39π/4 ft

• 13π/4 ft

• 4π/13 ft

A full rotation of a circle can be measured in how many radians?

• 180

• 360

• π

• 2π

Move the angles in radians to their correct location on the unit circle

e

f

g

h

d

c

b

a

Using θ as a reference angle, mark the triangle sides as Opp, Adj, and Hyp. Label these on the triangle on your paper.

• Opp

• y

• Hyp

• x

• Adj

• OP