Vector Calculus · Medium problem

Use Green's theorem (in the area form $\text{Area}=\dfrac12\displaystyle\oint_C x\,dy-y\,dx$) to find the area enclosed by the quadrilateral with vertices $(0,0)$, $(4,0)$, $(5,3)$, $(1,2)$, taken in this (counterclockwise) order.