# Surface area of Rectangular Prisms?

How do you find the Surface Area of a Rectangular prism???

Relevance

you just need to think of it as adding all of the separate surface's areas as if they were each 2-dimensional shapes. here's the technical formula for any rectangular prism:

if the prism has lengths base b, height h, and width w, the surface area is

2bh + 2bw + 2hw

• Find the volume of a prism that has a base area of 24 cm2 and a height of 12 cm

• Anonymous
9 years ago

If the prism is defined by length (L), width (W) height (H).

2(L*W) + 2(L*H) + 2(W*H) = 2LW + 2LH + 2WH = 2( LW + LH + WH)

You can do it another way by calculating the perimeter of one of the sections of the rectangle, and multiplying by the left over dimension. Then you would need to also add the sections of the ends.

Ex. (2H + 2W) * L + 2(H*W) = 2HL + 2WL + 2HW = 2 (LW + LH + WH)

Which is in effect the same result.

• Given length L, width W and height H:

2LH + 2LW + 2HW

It is basically six retangular surfaces organised as three pairs. You find the surface are of each one by multiplying their sides together.