We can't calculate that until we know the length of either of the other sides.
All we know now is that the longer leg is
-- sqrt(3) times the shorter leg, and
-- sqrt(3)/2 times the hypotenuse
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A right triangle with a hypotenuse of length 15 and a leg of length 8 has an area of: 50.75 units2
The other leg length is 16.
Using Pythagoras' theorem it works out as 6 feet
Using Pythagoras' theorem for right angle triangles then the other leg is 6 feet long
Use Pythagoras' theorem: 82+92 = 145 and the square root of this is the answer.