Question

A rectangular prism has dimensions 8ft by 3ft by 5ft what is the surface area of the prism

Answer 1

We have 6 faces of a rectangular prism

For the rectangle 8 ft x 3ft we have 2 equals

The area of one is

`A_1=l* w=8*3=24ft^2`

for the rectangle 8 ft x 5ft we have two equals

the area of one is

`A_2=l* w=8*5=40ft^2`

for the rectangle 5ft x 3ft we have two equals

the area of one

`A_3=l* w=5*3=15ft^2`

The surface area is

`SA=2(A_1)+2(A_2)+2(A_3)`
`SA=2(24)+2(40)+2(15)`
`SA=158ft^2`