Question

Find the area enclosed by the figure where a = 15 ft, b = 45 ft, c = 20 ft, d = 75 ft, and f = 40 ft.
Reiny
If a, b , etc are sides of a pentagon, then we don't have enough information, since the figure is not "rigid"

Did you have some angles given?
edwin
show that points (3,-1) (4,2) (1,3) and (-2,-1) the vertices kite-shaped quadrilateral find its area