Question

Find the polar coordinates of the point. Then, express the angle in degrees and again in radians, using the smallest possible positive angle.

(2√3,-2)
The polar coordinates of the point are

Answer 1

(4cos150, 4sin150) or (4cos5pi/6, 4sin5pi/6)

Explanation:

Given the rectangular coordinate

(2√3,-2)

x = 2√3

y = 2

For polar coordinate;

x =r cos theta

y = rsin theta

r = √x²+y²

r = √(2√3)²+(-2)²

r = √4(3) + 4

r = √12+4

r = 4

theta = arctan(y/x)

theta = arctan(-2/2√3)

theta = arctan(-1/√3)

theta = -30

theta = 180 - 30

theta = 150degrees

x = 4cos 150

y = 4sin150

The polar coordinate is (4cos150, 4sin150) or (4cos5pi/6, 4sin5pi/6)

The polar coordinates of the point are