Posted by mike on Wednesday, October 27, 2010 at 12:58am.
first of all, i don't know if there is a figure given in your question,, but if there is not, you have to imagine,,
it is composed of a trapezoid EBCD and triangle AED,, therefore,
Area,trapezoid = (b1+b2)*h/2
Area,triangle = bh/2
A,trap = (13+15)*18/2 = 252 sq yards
A,tri = (20*15)/2 = 150 sq yards
**note that 20 came from 38-18
therefore,
A,quad = 252+150 = 402 sq yards
so there,, :)