Use green's theorem to compute the area inside the ellipse( x^2/13^2)+(y^2/6^2)=1.
use the fact that the area can be written as

dub intd dxdy=(1/2) int partiald (-y dx+x dy) .
hint: x(t)=13cos(t).
the area is?

b)
find a parametrization of the curve x^(2/3)+y^(2/3)=8^(2/3) and use it to compute the area of the interior.
hint: x(t)=8cos^3(t).