Answer
See image below.
Work Step by Step
First, define r as a function of $\theta$
Then build a table of values for $\theta=0,\pi/12,\pi/6,...$
(start with 0, add $\pi/12 $ to next $\theta$)
and for each $\theta$ calculate
x coordinate = $ f(\theta)\cdot\cos\theta,\qquad y=f(\theta)\cdot\sin\theta$
Plot the points and join with a smooth curve.
(Work done in geogebra.)
