# Thread: Conversion: Polar form to rectangular form.

1. ## Conversion: Polar form to rectangular form.

r=2cos(theta)

r=2(x/r)

r^2=2x

x^2+y^2=2x

x= rcos(theta)

the answer in the book is (x-1)^2+y^2=1

2. ## Re: Conversion: Polar form to rectangular form.

Originally Posted by math951
r=2cos(theta)

r=2(x/r)

r^2=2x

x^2+y^2=2x

x= rcos(theta)

the answer in the book is (x-1)^2+y^2=1
$r = 2 \cos(\theta)$

$r^2 = 2r \cos(\theta)$

$x^2 + y^2 = 2x$

$x^2-2x +y^2 = 0$

$(x-1)^2 -1 + y^2 = 0$

$(x-1)^2 + y^2 = 1$