there is a special theorem for the isosceles right triangle. It states the hypotenuse is the leg multiplied by the square root of 2. Let c equal the hypotenuse. The equation will be then be 3 times the square root of 2 multiplied by the square root of 2 equals c. The square root of 2 times the square root of 2 is the square root of 4 which is two. Then 3 times 2 is c. Thus c equals 6. the hypotenuse is 6.