Understanding and measuring angles

Locate 9π

• I

• E

• A

• M

What is the reference angle for -30 degrees?

• 150 degrees
• 30 degrees
• 80 degrees
• 60 degrees

Which is a coterminal angle to the angle shown?

• -157

• -158

• -159

• -160

What can we say about the angle and the reference angle?

• They add up to 180 degrees

• They are obtuse

• Their difference is 90 degrees.

Find the measure of the red angle.

• $325\degree$

• $55\degree$

• $145\degree$

• $305\degree$

Which quadrant is 280° in?

• I

• II

• III

• IV

 $\frac{10\pi}{9}$  What quadrant is the measurement to the left in?

• I

• II

• III

• IV

Plot each point given in polar coordinates and find the other polar coordinates (r,θ) if the point which  r >0, -2π≤θ<0.
(-2,3π)

• (2, -2π)
• (-2, π)
• (2, 2π)
• (-2, -2π)

Which angle is coterminal to 480 degrees?

• -480 degrees

• 60 degrees

• 120 degrees

• 280 degrees