Reference Angles Unit Circle

Find the measure of the angle marked in red.

• -230°

• 130°

• 230°

• 50°

Convert 100⁰ to radians

• 5π/9
• π/2
• 5π/8
• 5π/6

What is 11π/6 radians in degrees? 

• 30
• 330
• 360
•  300

How many radians does a circle have?

•   360 degrees
• 2pi radians
• pi radians
• ^{2 radians}

Standard position is when .....

• the initial side of the angle is on the positive x-axis.
• the initial side of the angle is on the negative x-axis.
• the initial side of the angle is on the positive y-axis.
• the initial side of the angle is on the negative y-axis.

What is 4π/3 radians in degrees?
 

• 120
• 240
• 210
• 270

Find a coterminal angle to 5°.

• 365°

• 255°

• -220°

• -365°

Convert 150⁰ to radians

• 5π/6
• 3π/4
• 7π/6
• 2π/3

Find the measure of the angle marked in red.

• -200°

• 200

• -110°

• 110°

Find the reference angle.

• -65°

• 125°

• -55°

• 55°