Answer:
236 in squared
Step-by-step explanation:
You can separate the shape into two rectangular prisms.
prism 1 - 9, 2 ,4
prism 2 - 4, 2, 8
Since the frosting is on the outside of the cake you have to find the surface area.
To find the surface area you use the equation:
2(wl + hl + hw)
Put in the values you know:
2(9 * 2 + 4 * 2 + 9 * 4)
multiply:
2(18 + 8 + 36)
Add:
2(62) = 124
Now you find the surface area of the second prism.
2(4 * 2 + 2 * 8 + 4 * 8)
Multiply:
2( 8 + 16 + 32)
Add:
2(56) = 112
Now add the two surface areas to get the surface area of the whole shape.
112 + 124 = 236
The answer is 236 in squared
