How do you graph r=2costheta?

1 Answer
A. S. Adikesavan
Apr 23, 2016

Draw the circle with center at #(r, theta)=(1,0) and radius 1 unit

Explanation:

Referred to (a, 0) as center and radius = a, the equation of the circle is r = 2a cos theta.

If O is the pole, OA = 2a is the diameter through O and P is any point (r, theta) on the circle, OP = r, angleAOP=theta. OP = OA cos theta.. So, r = 2a cos theta

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