How do i find surface area of a prism?

Step-by-step explanation:

If you want the surface area of a rectangular prism, then you'll use a formula resembling this:

A = 2(area of end) + 2(area of top) + 2 (area of side).

Example:  suppose the dimensions of the prism are 3 in by 5 in by 8 in.

Then the total surface area is:

A = 2(3*5) + 2(3*8) + 2(5*8) square inches, or 2(15) + 2(48) + 2(40) sq in, or

A = 30 + 96 + 80 sq in, or A = 206 sq in

l.ln.lln.k.nkl

step-by-step explanation:

56.6

step-by-step explanation:

the ratio of the perimeters is equal to the scale.

the ratio of the areas is equal to the square of the scale.

34 / 20 = k

a / 19.6 = k²

substituting:

a / 19.6 = (34 / 20)²

a = 19.6 (34 / 20)²

a ≈ 56.6