Question

Find the rectangular coordinates of the point with the polar coordinates (7, 2pi/3)

Answer 1

Polar coordinates are given by (r,θ).
Rectangular coordinates are given by (x,y)=(rcos θ,rsin θ)

You are given the r and the θ.

You need to find  what 7cos(2π3) is, then find 7sin(2π3). 

x=−7/2
y=7√3/2