Quadrant 1: Unit Circle Basics (Degrees)

What is the radius of the unit circle?

• 1
• 2
• 10
• It varies.

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

• $\left(0,\ 1\right)$

• $\left(\frac{1}{2},\ \frac{\sqrt{3}}{2}\right)$

• $\left(\frac{\sqrt{3}}{2},\ \frac{1}{2}\right)$

• $\left(\frac{\sqrt{2}}{2},\ \frac{1}{2}\right)$

What are the coordinates at 30° on the unit circle?

• $\left(1,\ 0\right)$

• $\left(\frac{1}{2},\ \frac{\sqrt{3}}{2}\right)$

• $\left(\frac{\sqrt{3}}{2},\ \frac{1}{2}\right)$

• $\left(\frac{\sqrt{2}}{2},\ \frac{1}{2}\right)$

What are the coordinates at 45° on the unit circle?

• $\left(\sqrt{2},\ \sqrt{2}\ \right)$

• $\left(\frac{\sqrt{2}}{2},\ \frac{\sqrt{3}}{2}\right)$
  

• $\left(\frac{\sqrt{3}}{2},\ \frac{1}{2}\right)\$
  

• $\left(\frac{\sqrt{2}}{2},\ \frac{\sqrt{2}}{2}\right)\$
  

Which of the following is the equation of a unit circle?

• x² + y² = 0

• x² + y² = 1

• (x + 1)² + y² = 1

• (x + 1)² + (y + 1)² = 1

Which image shows a 45 - 45 - 90 triangle used correctly in a unit circle?

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• 
• 
• 

Which image shows the proper spacing for the angles in the unit circle?

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• 
• 
• 

What are the coordinates at 0^o on the unit circle?

• (1, 0)

• (0, 1)

• (0, -1)

• (-1, 0)

What are the coordinates at 90^o on the unit circle?

• (1, 0)

• (0, 1)

• (0, -1)

• (-1, 0)

True or False:

45 - 45 - 90 Triangles are Isosceles

• True

• False