Evaluate the integral $by$ interpreting $itin$ terms $of$ areas.

${\displaystyle \underset{-7}{\overset{7}{}}}\sqrt[\phantom{2}]{49-x^2}$

$\frac{15}{2}$

$\frac{13}{2}$

$\frac{7}{2}$

$\frac{11}{2}$

$\frac{49}{2}$