Question

Find the lateral surface area of the rectangular prism. hight 5 in. length 21 in. width 11 in.

Answer 1

Given a rectangular prism :

Height = h = 5 in

Length = l = 21 in

Width = 11 in

Lateral surface area = height * perimeter of the base = h * p

Perimeter of the base = p = 2 * ( length + width )

`\begin{gathered} p=2(l+w)=2\cdot(21+11)=2\cdot32=64 \\ \end{gathered}`

So, lateral area =

`h\cdot p=5\cdot64=320in^2`

So, the answer is : 320 in^2