Assuming the room is cuboid in shape,
let L = length, W = width and H = height.
The surface area = 2*(L*W + W*H + H*L)
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Measure its diameter.The surface area of a sphere is [ pi D2 ] .
Take the surface area of the sphere as of it was whole, and divide by the amount of the sphere that is missing.
For a room that is a rectangle, multiply length times width.
Resistance to deformation.
You need three measures of length to determine the surface area - the length, width and height.