Find the centroid of the given solid region assuming a density of ( x , y ) = 1 ( x , y

Find the centroid of the given solid region assuming a density of $\delta (x,y)=1$.

Region bounded by the $xy$-plane, the cylinder $x^2+y^2=R^2$, and the plane $x/R+z/H=1$, where $R>0$ and $H>0$