The definition of 'perimeter' is the sum of the distances around a given two-dimensional object. Assuming that we are referring to a rectangular room (or at least a 4-sided room with 2 sets of parallel sides), then the answer is simply 2(30 + 40) = 140 feet.
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12 feet
40 feet
A rhombus can't have two different side lengths. They all must be the same. If the sides are 30-in, then the perimeter is 120-in. If they're 40-in, then the perimeter is 160-in.
40
If the table is a circle and the perimeter is 40 feet, then the diameter (rounded to 2 decimal places) would be 12.74 circumference = diameter x pi so, diameter = circumference / pi