A point is given in rectangular coordinates (−9, −9) Convert the point to polar coordinates (r > 0, 0 ≤ 𝜃 < 2𝜋).

Answer 1

(9sqr2, 5pi/4)

or

(12.726, 1.25pi)

r^2 = (-9)^2 + (-9)^2 = 81+81 = 162

r = sqr162 = 9sqr2 = about 9(1.414) = 12.726

theta is 45 degrees plus 180 = 225 or

pi/4 + pi = 5pi/4 = 1.25pi