The length of the hypotenuse of a right triangle is the square root of the sum of the squares of the other two sides.
(302 + 242)½ = (900 + 576)½ = 1476½ ≈ 38.4
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The diagonal length is about 20.59
The room measures 16 meters x 8 meters and has a diagonal measurement of 17.9 meters.
67'1"
The square has a diagonal measurement of: 1.13 km
If they are the dimensions of a rectangle then use Pythagoras' theorem to find the length of the diagonal.