1. What is the shape formed by a horizontal cross-section parallel to the base of the right rectangular pyramid? A right rectangular pyramid is shown. The base is shaded. A. Circle
B. Triangle
C. Rectangle
D. Trapezoid

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

-6 is the correct option from the above given options