$5\mathrm{.}21$ and $5\mathrm{.}22$ The horizontal $x$ axis is drawn through the centroid

$C$ of the area shown, and it divides the area into two component

areas $A_1$ and $A_2.$ Determine the first moment of each component

area with respect to the $x$ axis, and explain the results obtained.

Fig. P$5\mathrm{.}22$