Unit Circle

What is the radius of a unit circle?

• 1
• 2
• 1/2
• 0

What are the coordinates of 60° on the unit circle?

• (0, 1)
• (1/2, √3/2)
• (√3/2, 1/2)
• (√2/2, 1/2)

What are the 3 basic trig functions?

• Sine, cosine, and cotangent

• Sine, cotangent, and cosecant

• Sine, cosine, and tangent

• Cosecant, cosine, and cotangent

If I wanted to find the sine of an angle, what side lengths would I need to know?

• base, hypotenuse

• hypotenuse, adjacent

• opposite, hypotenuse

• adjacent, opposite

The cosine of an angle can be calculated by which expression?

• $\frac{hypotenuse}{adjacent}$

• $\frac{opposite}{adjacent}$

• $\frac{adjacent}{hypotenuse}$

• $\frac{adjacent}{opposite}$

 $\tan\left(\theta\right)$  of an angle,  $\theta$ can be expressed as which of the following?

•  $\frac{opposite}{hypotenuse}$  

•  $\frac{opposite}{adjacent}$  

•  $\frac{\sin\left(\theta\right)}{\cos\left(\theta\right)}$  

•  $\frac{hypotenuse}{adjacent}$  

*

• csc x
• sec x
• cot x
• tan x

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

Angles are measured in which direction from standard position?

• Clockwise
• Counterclockwise