Compute the area enclosed within polygon ABDFGA?

The $($X$,$Y$)$ coordinates $($in feet$)$ for a closed$-$polygon traverse ABCDEA follow.

A $(88\mathrm{.}5,64\mathrm{.}4),$ B $(98\mathrm{.}5,77\mathrm{.}32),$ C $(55\mathrm{.}4,90),$ D $(30\mathrm{.}55,80\mathrm{.}2)$ and E $(30\mathrm{.}55,70)$ and F $(40,$

$53\mathrm{.}5).$ Calculate the area of the traverse by the method of coordinates.