surface area of a rectangular prism of L=12cm, W= 8cm, H=4cm

Question

I need help with this question for my exam revision that is coming up very soon

Answer 1

For a rectangular prism:

 

Surface Area = (2 × Area of Base) + (Perimeter of Base × Height)

• Area of Base = L × W = 12 × 8 = ___ cm²
• Perimeter of Base = 2L + 2W = 2·12 + 2·8 =___ cm²
• Height = 4 cm

 

Plug the numbers into the formula.  Units are cm².