Assuming that the 40 and 30 refer to sides of a rectangle and not to any of the infinite number of other possible shapes, the answer is 50.
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A square with a 30-inch diagonal measurement has sides of 21.21 inches in length.
The diagonal length is about 20.59
Sqrt(282 + 402) = a whisker under 48 ft 10 in
To find the diagonal measurement of a 20ft x 30ft building, you can use the Pythagorean theorem. The formula is (d = \sqrt{(length^2 + width^2)}). Plugging in the values, (d = \sqrt{(20^2 + 30^2)} = \sqrt{(400 + 900)} = \sqrt{1300} \approx 36.06) feet. Thus, the diagonal measurement is approximately 36.06 feet.
67'1"