Exploring the Unit Circle Fundamentals

What is the radius of the unit circle?

• 0 units

• π units

• 2 units

• 1 unit

How many degrees are there in a full rotation of the unit circle?

• 360 degrees

• 180 degrees

• 90 degrees

• 270 degrees

What angle measurement corresponds to π radians?

• 90 degrees

• 180 degrees

• 360 degrees

• 270 degrees

Which triangle is not directly used when adding measurements to the unit circle?

• 30-60-90 triangle

• 45-45-90 triangle

• Isosceles triangle

• Equilateral triangle

What is the radian measure for 30 degrees?

• π/4

• π/6

• π/2

• π/3

What is the ordered pair for the point at 90 degrees on the unit circle?

• (1,0)

• (0,-1)

• (0,1)

• (-1,0)

What is the x-coordinate of the point at 180 degrees on the unit circle?

• √2/2

• 0

• -1

• 1

What is the cosine of 30 degrees using the unit circle?

• 1/2

• √3/2

• 0

• √2/2

What is the sine of 45 degrees using the unit circle?

• 1/2

• 0

• √3/2

• √2/2

In which quadrant is the cosine positive and sine negative?

• Quadrant I

• Quadrant IV

• Quadrant II

• Quadrant III