Unit Circle

Front

What is the definition of the Unit Circle?

Back

The Unit Circle is a circle with a radius of 1 centered at the origin (0,0) in the coordinate plane, used to define trigonometric functions.

Front

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

Back

(1, 0)

Front

What is sin 0°?

Back

0

Front

What is cos 0°?

Back

1

Front

What are the coordinates of 90° on the unit circle?

Back

(0, 1)

Front

What is sin 90°?

Back

1

Front

What is cos 180°?

Back

-1

Front

What are the coordinates of 180° on the unit circle?

Back

(-1, 0)

Front

What is sin 270°?

Back

-1

Front

What are the coordinates of 270° on the unit circle?

Back

(0, -1)