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Pythagorean theorem A^2+B^2=C^2
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If you know the length of one side - and the area... divide the area by the known side - to get the value of the unknown.
It depends on what information about the other sides and angles you do have.
You begin by finding the length of the unknown side. The square of the hypotenuse is equal to the sum of the squares of the two legs. Then once you have the lengths of all 3 sides, you adum all up, and you have the perimeter.
It can be found by: hypotenuse squared minus known side squared = unknown side squared
Let's call the unknown length x and use Pythagoras' theorem: x2+(x+3)2 = (x+6)2 By substituting 9 for x you'll find that only 9 will satisfy the above conditions. Shorter side = 9 units Longer side = 12 units Hypotenuse = 15 units