If the legs of an isosceles right triangle have a length of 15 square root of 2 ft, what is the length of the hypotenuse?

In an isosceles right triangle, the hypotenuse equals a leg multiplied by √2. Thus, the hypotenuse is (15√2) × √2 = 15 × 2 = 30 feet. The correct choice is 30 feet.

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