Find the diameter of cone that has a volume of 56.52 cube inches and a height of 6 inches use 3.14 for pi

The volume of the cone is; (1/3)pi * r²h

56.52 = (1/3) * 3.14 * r² * 6

56.52/(2 * 3.14) = r²

9 = r²

r² = 9

r = √9

r = 3

Diameter = 2*r = 2*3 = 6 inches

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