Question

Three same-sized cubes are attached to the top of a rectangular prism as shown below.



If a = 9 cm, b = 24 cm, and c = 3 cm, what is the surface area of the figure?
A.
945 square centimeters
B.
1,161 square centimeters
C.
1,134 square centimeters
D.
1,188 square centimeters

Answer 1

ok what grade

Answer 2

I can't find the original figure, but I will give some pointers that will help guide you towards your solution:

SA of a rectangular prism: 2LW + 2WH + 2LH
(basically, on a rectangular prism there are 3 types of faces, with 2 copies of each face. find the area of each face and sum them up)

a cube is special type of rectangular prism in which all sides are equal. applying the formula gives us 6x^2 where x is one of the side lengths

for the composite figure, add up all faces that are on the outside of the figure, then subtract any that are hidden from the surface