$4.$ Use geometry $($not Riemsnn suma$)$ to evoluate the following definite integrals. Sketch a graph of the integrand, show the region in question, and interpret your result

${\displaystyle \underset{-1}{\overset{3}{}}}\sqrt[\phantom{2}]{4-(x-1{)}^2}dx$

$5.$ Evaluate the following integrals using the Fundamantal Theorem of Calculus. Sketch the graph of the integend and shade the ragion whose net area you have found.

${\displaystyle \underset{\frac{1}{2}}{\overset{2}{}}}(1-\frac{1}{x^2})dx$