Unit Circle (with radians)

What is the radius of the unit circle?

• 1
• 2
• 10
• It varies.

The sine of any angle on the unit circle is the y-coordinate.

• True
• False

The cosine of any angle on the unit circle is the y-coordinate.

• True
• False

When drawing a right triangle from any point on the unit circle to the x-axis, the hypotenuse is equal to one.

• True
• False

• 1

• 1/2

• √3/2

• √2/2

What is the  $\cos\left(\frac{3\pi}{4}\right)$  ?

• √3/2

• -√3/2

• √2/2

• -√2/2

What is  $\tan\left(\frac{5\pi}{6}\right)$  ?

• √3

• -√3

• √3/3

• -√3/3

 $\cos\left(\frac{4\pi}{3}\right)$  

• 1/2

• -1/2

• √3/2

• -√3/2

 $\cos\left(\frac{5\pi}{4}\right)$  

• -√3/2

• -1/2

• -√2/2

• √2/2

 $\tan\left(\frac{5\pi}{4}\right)$  

• √2/2

• -√2/2

• -1

• 1