Question

Look at this prism and its net. Rectangular prism with length labeled 5 meters, width labeled 7 meters, and height labeled 12 meters. Net of the same rectangular prism with the same dimensionsn labeled. What is the surface area of this rectangular prism?

Answer 1

There will be three pairs of matching sides: one pair 5x7, one pair 5x12 and one pair 12x7. We can compute the are of each side (in pairs) and then add up the total:


`A_(surf)=2*(l * w)+2*(l * h)+2*(h * w)`

`A_(surf)=2*(5*7)+2*(5*12)+2*(12*7)`

`A_(surf)=2*35+2*60+2*84`

`A_(surf)=70+120+168`

`A_(surf)=358`

`A_(surf)=358m^(2)`