6 feet
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The length of the hypotenuse of a right triangle that has a base of 3 feet and a height of 12 feet is: 12.37 feet.
Area of triangle: 0.5*3*4 = 6 square feet
Given the legs a and b of a triangle are 3 and 4, the hypotenuse is: 5
It is: 0.5*3*4 = 6 square feet
The length of the third side of this triangle must be greater than 1 foot and less than 5 feet, and the third side would be either 2 feet or 3 feet if it were an isosceles triangle.