Question

The rectangular coordinates of a point are given (-5,-5root3). Find polar coordinates of the point. Express theta in radians.

Answer must be in form

​(Type an ordered pair. Type an exact answer in terms of pi.Use integers or fractions for any numbers in the expression. Type the coordinate for theta in radians between 0 and 2pi)

My answer is (10,pi/3)but website is not accepting it . tell me mistake i am doing and the right answer

Answer 1

r^2 = 25 +25*3 = 100
so
r = 10

tan theta = sqrt3 in quadrant III
60 degrees below x axis
pi + pi/3 = 4 pi/3

you are in third quadrant because x and y are negative

Answer 2

my bad thank you sir

Answer 3

No problem :) You are welcome.