How do you convert #r = 2a cosθ# into a cartesian equation? Precalculus Polar Coordinates Converting Equations from Polar to Rectangular 1 Answer Teddy Jun 14, 2018 #x^2+y^2=2ax# Explanation: 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#. Answer link Related questions What is the polar equation of a horizontal line? What is the polar equation for #x^2+y^2=9#? How do I graph a polar equation? How do I find the polar equation for #y = 5#? What is a polar equation? How do I find the polar equation for #x^2+y^2=7y#? How do I convert the polar equation #r=10# to its Cartesian equivalent? How do I convert the polar equation #r=10 sin theta# to its Cartesian equivalent? How do you convert polar equations to rectangular equations? How do you convert #r=6cosθ# into a cartesian equation? See all questions in Converting Equations from Polar to Rectangular Impact of this question 15891 views around the world You can reuse this answer Creative Commons License