# How do you write the polar equations for x^2+y^2=x?

Jan 10, 2016

$r = \cos \theta$

#### Explanation:

using the fact that ${r}^{2} = {x}^{2} + {y}^{2} \mathmr{and} x = r \cos \theta$

we can convert cartesian form to polar form.

$\Rightarrow {r}^{2} = r \cos \theta$

now , dividing both sides of the equation by r gives

${r}^{2} / r = \frac{r \cos \theta}{r}$

$\Rightarrow r = \cos \theta$