Which of the following polar equations is a circle with its center at the pole and a radius of 3? θ = 3
r = 3
r = 9
3 r = θ

The first one, i believe, would be correct. all the others have one thing in common, and that's that they have repeating numbers. in the second one, x and y have repeating 6's and 3's, and in the third, x and y have repeating 6's as well. in the last one, there are repeating 3's. the first one has no repeating numbers.

Dis the solution here