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A variable.
If the hypotenuse and a leg of a right triangle are congruent to the hypotenuse and a leg of another right triangle, then the triangles are congruent.
Only a right triangle has a hypotenuse, and yes,when there's a hypotenuse, it's the longest side.
That depends entirely on the LENGTH of the hypotenuse !
Hypotenuse squared = 12 squared + 5 Squared so Hypotenuse Squared = 144 + 25 so Hypotenuse = Square root of 169 = 13cm