How do you solve surface area?

The formula for surface area depends on the shape you are solving for.

Here are a couple:

Surface area of a sphere: 4πr²

Surface area of a cube: 6a² (when a = length of a side)

Surface area of a rectangular prism = 2 (wl + hl + hw)

Surface area of a cone = πr (r + √ (h² + r²))

The rest are all online, but are different for each figure.

Hope this is what you were looking for.