The Unit Circle (Reference Angles, Signs, Ratios)

What is the reference angle for cos 125°?

• cos 235°

• - cos 125°

• cos 75°

• - cos 55°

What is the reference angle for

tan (-30°)?

• - tan 150°

• - tan 30°

• tan 80°

• cot 60°

What is the reference angle for csc (-310⁰)?

• csc 50⁰

• csc (-50⁰)

• sec 20⁰

• sin 50⁰

What is the reference angle for 275°?

• 85°

• 95°

• -85°

• -95°

Tags

CCSS.HSF.TF.A.3

CCSS.HSG.SRT.C.6

CCSS.HSG.SRT.C.8

sinθ is positive in

• the 1st and 2nd quadrants
• the 1st and 3rd quadrants
• the 1st and 4th quadrants
• the 2nd and 3rd quadrants

Tags

CCSS.HSF.TF.A.2

cosθ is negative in

• the 1st and 2nd quadrants

• the 1st and 4th quadrants

• the 3rd and 4th quadrants

• the 2nd and 3rd quadrants

tanθ is positive in

• the 1st and 2nd quadrants

• the 1st and 3rd quadrants

• the 1st and 4th quadrants

• the 2nd and 3rd quadrants

Tags

CCSS.HSF.TF.A.2

Evaluate: cot π/2

• undefined

• 0

• 1

• 1/2

Evaluate: tan (-π)

• undefined

• 0

• 1

• -1

Evaluate: sec 3π/2

• 0

• undefined

• 1

• -1