Question

How much frosting will be needed to frost a cake that is a rectangular prism with the length of 13 inches, width 10 inches & height of 4 inches

Answer 1

surface area of a rectangular prism = 2(wl + hl + hw)
l = 13
w = 10
h = 4

SA = 2((10*13) + (4*13) + (4*10)) 
SA = 2((130 + 52 + 40))
SA = 2(222)
SA = 444 inches^2 <===