Which statement describes the graph and orientation of the parametric equations x=9cost and y=9sint?

Question

A.The graph is a circle with a radius of 3. The orientation is counterclockwise as t increases.
B. The graph is a circle with a radius of 9. The orientation is clockwise as t increases.
C. The graph is a circle with a radius of 3. The orientation is clockwise as t increases.
D. The graph is a circle with a radius of 9. The orientation is counterclockwise as t increases.

Answer 1

note that x^2+y^2 = 9
now review how angles are graphed in polar coordinates.

Answer 2

@ ooblek. I appreciate your assistance. How did you get x^2+y^2=9 from the problem?