Determine the following integrals

$($a$)$

${}_R{x}^2+y^{2}dA$ where $R$ the $is$ square $[0,1][0,1]$

$($b$)$

${}_R{x}^2+y^{2}dA$ where $R$ the is circle of radius $1$ centered at $(0,0)$

$3$