Find the Reference Angle in the Unit Circle

What is the reference angle for 240 degrees?

• 60 degrees
• 30 degrees
• 45 degrees
• 210 degrees

Find the reference angle for an angle measuring -300⁰

• 60⁰

• -60⁰

• 30⁰

• 45⁰

Find a coterminal angle to -180 degrees.

• 180
• 90
• 270
• 360

Find a coterminal angle to 45 degrees.

• 360
• 405
• 315
• 295

Which quadrant is -570⁰

• I
• II
• III
• IV

Formula [Reference angle = Actual angle - 180] is for

• quadrant 1

• quadrant 2

• quadrant 3

• quadrant 4

What is the reference angle for 30 degrees?

• 70 degrees
• 30 degrees
• 150 degrees
• 330 degrees

What is the reference angle for -30 degrees?

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

What is the reference angle for 240 degrees?

• 60 degrees
• 30 degrees
• 45 degrees
• 210 degrees

What is cos(810)?

• 1/2

• 1

• 0

• -1