Green's theorem applied to polar graph

[csnsc14320]

Homework Statement

Use Green's theorem to compute the area of one petal of the 28-leafed rose defined by $$r = 5sin(14 \theta)$$

Homework Equations

$$A = \frac{1}{2} \int_c{x dy - y dx}$$
$$\int \int_c{M_x + N_y}dx dy$$

The Attempt at a Solution

I'm really more confused about just what to do outright. Green's theorem tells me that I can take the integral in that area formula and compute the double integral of the divergence of a vector field F = <M(x,y),N(x,y)>, but I have no idea how that helps me since I don't see any vector field here and I don't know the components N and M.

I think maybe I need to turn the expression $$r = 5sin(14 \theta)$$ into cartesian coordinates, but not really seeing what to do from here.

there's just too many equalities in greens theorem >:(

 

[tiny-tim]

Hi csnsc14320!

(your equations look a bit odd)

Hint: you're looking for a function whose curl is constant.