Converting Polar Equations to Cartesian Equations
posted by Adrianna .
If theta= pi/3 , then to convert to a Cartesian equation, let x =
A.(1/2)r
B.(square root of2/2)r
C.(square root of 3/2)r

x=r cos(θ)
=r cos(π/3)
=r cos(π/3*180/π)
=r cos(60°)
I'll let you complete with the calculator. 
Y= root3 x

r2 = 6rcos(θ) + 7rsin(θ)