area of part 1:
a1=base*height/2=(8+2)*(8-2-2-1)/2=10*3/2=15 ft^2
area of part 2:
a2=length*width=(8+2)*1=10 ft2
area of part 3:
a3=length*width=8*2=16 ft2
total shaded area : a1+a2+a3=41 ft2
total area of the reactangle : a=16*8=128 ft2
total area of the nonshaded region : 128-41=87 ft2
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step-by-step explanation:
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