The Unit Circle

Front

What is the radius of a unit circle?

Back

1

Front

What is the value of sine at 150°?

Back

1/2

Front

What is tan(-π)?

Back

0

Front

What is cos 60°?

Back

1/2

Front

In which quadrants is tanθ positive?

Back

the 1st and 3rd quadrants

Front

Define the unit circle.

Back

A circle with a radius of 1 centered at the origin of a coordinate plane.

Front

What are the coordinates of the point at 0° on the unit circle?

Back

(1, 0)

Front

What is the value of sine at 90°?

Back

1

Front

What is the value of cosine at 180°?

Back

-1

Front

What is the relationship between sine and cosine in the unit circle?

Back

sin²θ + cos²θ = 1