The Unit Circle

Front

What is the unit circle?

Back

The unit circle is a circle with a radius of 1 unit centered at the origin (0,0) in the coordinate plane.

Tags

CCSS.HSF.TF.A.2

Front

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

Back

(1, 0)

Tags

CCSS.HSF.TF.A.2

Front

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

Back

(0, 1)

Tags

CCSS.HSF.TF.A.2

Front

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

Back

(-1, 0)

Tags

CCSS.HSF.TF.A.2

Front

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

Back

(0, -1)

Tags

CCSS.HSF.TF.A.2

Front

In which quadrants is cosθ positive?

Back

In the 1st and 4th quadrants.

Tags

CCSS.HSF.TF.A.2

Front

In which quadrants is sinθ positive?

Back

In the 1st and 2nd quadrants.

Tags

CCSS.HSF.TF.A.2

Front

What is the reference angle for 150°?

Back

30°

Front

What is the reference angle for -30°?

Back

30°

Front

What is the cosine of 150°?

Back

-√3/2

Tags

CCSS.HSF.TF.A.2