Topic 2 - Check for Understanding

If an angle is in radians, the reference angle...

• Should switch to degrees
• Should also be in radians
• It doesn't matter
• There's a difference between the two??

A reference angle should be ...

• Less than 90⁰ or π/2
• 90⁰ or π/2
• greater than 90⁰ or π/2
• it can be any value

What is the reference angle for 11π/6?

• π/6
• π/3
• π/4
• 5π/6

What is the reference angle for 5π/4?

• π/4
• 7π/4
• π/6
• π/3

What is the reference angle for 240 degrees?

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

Convert from radians to degrees:  7π ∕ 4

• 330°
• 45°
• 315°
• 75°

Tags

CCSS.HSF.TF.A.1

What is the reference angle for 2π/3?

• π/4
• 7π/6
• 4π/3
• π/3

Convert from degrees to radians:  135°

• 2π ∕ 3
• 3π ∕ 4
• 5π ∕ 4
• 3π ∕ 5

Tags

CCSS.HSF.TF.A.1

Find the reference angle for an angle measuring θ = -2π / 3

• π / 3
• 2π /3
• -π /3
• 60⁰

Tags

CCSS.HSF.TF.B.7

sin(7π/4)

• 1/2
• -√2/2
• √2/2
• -1/2

Tags

CCSS.HSF.TF.A.2