Intro to the Unit Circle

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

• 1
• 0
• -1
• 1/2

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

• 1/2
• 0
• -1
• 1

sin(5π/3)=

• 1/2
• -√3/2
• √3/2
• -1/2

sin(7π/4)

• 1/2
• -√2/2
• √2/2
• -1/2

sin(3π/2)

• 0
• 1
• -1
• 1/2

Find the exact value of cosine 135º.

• - √2/2
• √2/2
• - √3/2
• 0

Based on your unit circle sin(30^o)=

• sqt2/2
• 1/2
• 1
• sqt3/2

Based on your unit circle cos(30^o)=

• 1
• 1/2
• sqt3/2
• sqt2/2

Tangent is...

• a. Opposite/hypotenuse
• b. sine/cosine
• c. neither a or b
• d. both a and b

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

• 1
• 0
• -1
• 1/2