Answer:
Surface Area = 2(lw + lh + wh)
Step-by-step explanation:
The surface area of a solid is defined as the sum of the areas of each of its faces (or surfaces), hence the name.
For rectangular prisms, each face is a rectangle and they come in pairs. Opposite faces are identical to each other and we multiply two dimensions at a time. Hence, the formula is as follows:
Surface Area = lw + lw + lh + lh + wh + wh
Surface Area = 2lw + 2lh + 2wh
Surafce Area = 2(lw + lh + wh)
