Find the missing side of the triangle shown below, if the perimeter is 81.

The missing side of the triangle if the perimeter is equals to 81 is 28.8
Perimeter is the sum of the whole sides of a figure. The perimeter of the triangle above is the sum of the whole three sides.
Therefore,
let
the missing side = x
perimeter = 81
27.7 + 24.5 + x = 81
52.2 + x = 81
subtract 52.2 from both sides
52.2 - 52.2 + x = 81 - 52.2
x = 28.8
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