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Answer 1 · 2016-10-09T14:43:08

We know the relations

#x=rcostheta and y =rsintheta#

Again #x^2+y^2=r^2#

where r and #theta# are the polar coordinate of a point having rectangular coordinate #(x,y)#

The given equation in rectanglar form is

#(x+2)^2+y^2=4#

#=>x^2+4x+4+y^2=4#

#=>x^2+y^2+4x=0#

#=>r^2+4rcostheta=0#

#=>r+4costheta=0#

This is the polar form of the given equation.