You can put this solution on YOUR website! Assuming the triangle is a right triangle (based on using the word 'hypotenuse'), we can use the Pythagorean Theorem:
where
c = hypotenuse
a = a leg = 6
b = the other leg = 12
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Substituting what we know:
.
Be sure to state the answer to the question:
The hypotenuse is 13.4164079.
.
Done.