Unit Circle

What is the exact coordinates of  3π/4 on the unit circle?

• (−√2∕2, √2∕2)

• (−√2∕2, −√2∕2)

• (−√3∕2, −√2∕2)

• (√2∕2, −√2∕2)

Tags

CCSS.HSF.TF.A.2

Based on your unit circle cos(0^o)=

• 1

• 0

• -1

• 1/2

Tags

CCSS.HSF.TF.A.2

Based on your unit circle sin(90^o)=

• 1/2

• 0

• -1

• 1

Tags

CCSS.HSF.TF.A.2

What is the radius of the unit circle?

• 0

• 1

• 1/2

• √2/2

Tags

CCSS.HSF.TF.A.2

What is the radius of a unit circle?

• 1

• 2

• 1/2

• 0

Tags

CCSS.HSF.TF.A.2

Unlike right triangle trigonometry, sine and cosine may be negative. Thinking about how sine, cosine, and tangent relate to (x,y) coordinate pairs on the unit circle, find the quadrants where: cosine is positive: ​ (a)   ​& (b)   cosine is negative: ​ ​ (c)   &​ (d)  

• I

• IV

• II

• III

Tags

CCSS.HSF.TF.A.2

sin 2π/3

• 1/2

• -1/2

• √3/2

• -√3/2

Tags

CCSS.HSF.TF.A.2

Q1. What is the value of sin(30°)?

• A) -√3/2

• B) -½

• C) -√2/2

• D) -1

Tags

CCSS.HSF.TF.A.2

What is the value of sine at 210°?

• 1/2

• -1/2

• √3 / 2

• -√3 / 2

Tags

CCSS.HSF.TF.A.2