The unit circle

Front

What is true about the unit circle? Options: a. The center of the circle is at the origin, b. the radius of the circle is 1 unit, both a and b, neither a nor b.

Back

Both a and b

Front

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

Back

(1/2, √3/2)

Front

sinθ is positive in

Back

the 1st and 2nd quadrants

Front

cosθ is positive in

Back

the 1st and 4th quadrants

Front

What is sin 45°?

Back

^√2/₂

Front

What is cos 30°?

Back

^√3/₂

Front

Exact coordinates of  3π/4 on the unit circle?

Back

(−√2∕2, √2∕2)

Front

What is cos 90°?

Back

0

Front

sin π/4

Back

√2∕2

Front

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

Back

x² + y² = 1