How do you convert #(-4, (5pi/4))# into cartesian form? Precalculus Polar Coordinates Converting Equations from Polar to Rectangular 1 Answer sankarankalyanam Jul 9, 2018 #color(orange)("Cartesian coordinates " (x,y) = (-4, -0.2739)# Explanation: #"Conversion from polar to Cartesian coordinates "# #x = r cos theta, y = r sin theta# #(r, theta) = (-4, (5pi)/4)# #x = r cos theta = -4 * cos ((5pi)/4) = -4# #y = r sin theta = -4 * sin ((5pi)/4) ~~ -0.2739# 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 2184 views around the world You can reuse this answer Creative Commons License