How do you convert $r = 2a cosθ$ into a cartesian equation?

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Answer 1 · 2018-06-14T00:31:11

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

Multiply both sides by $r$ to get $r^2=2arcostheta$ . Use the fact that $r^2=x^2+y^2$ and that $x=rcostheta$ to get $x^2+y^2=2ax$ .

How do you convert r = 2a cosθr = 2a cosθ into a cartesian equation?