How do you convert $r = 4$ into cartesian form?

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Answer 1 · 2016-05-19T16:56:26

$x^2+y^2=16$

The relation between polar coordinates $(r,theta)$ and Cartesian coordinates $(x,y)$ is given by

$x=rcostheta$ , $y=rsintheta$ , $r^2=x^2+y^2$ .

Using them $r=4$ is $r^2=16$ or $x^2+y^2=16$

which is the equation of circle with radius $4$ .

How do you convert r = 4 r = 4 into cartesian form?