Figure $9$ Plane Area. Problems $26-31$

Problem $26$ Find the area, A$,$ of the shaded areas.

Problem $27$ find the $x$ coordinate, $\stackrel{}{x},$ of the centroid of the shaded area.

Problem $28$ find the $y$ coordinate, $\frac{?}{\text{b}\text{a}\text{r}}(y),$ of the centroid of the shaded area.

Problem $29$ Find the moment of inertia about the $x-$axis, $I_x.$

Problem $30$ Find the moment of inertia about the $y-$axis, $Iy.$

Problem $31$ Find the product of inertia, $I_{xy}.$