ANSWER FOR A$=18\mathrm{.}016$ UNIT$^2,$ AND B VOLUME, V$=291\mathrm{.}61$UNIT$^2$

$($a$)$ Find the area of the shaded region in $uni{t}^2$

$($b$)$ Given that the volume if a function $y$ is completely rotated about the $x-$axis is expressed as below

$V={\displaystyle \underset{a}{\overset{b}{}}}{y}^{2}dx$

Calculate the volume if the shaded area calculated in $($a$)$ is rotated $360$ about the $x-$axis.answer$=18.$Answer for A