in 6th century B.C. Pythagoras discovered a relationship between the hypotenuse of a right triangle and its 2 legs, namely, the sum of the squares of the two legs will always = to the square of the hypotenuse.
The most common one is the 3-4-5 rt triangle, the others are 5-12-13, 8-15-17, 7-24-25 and 9-40-41.
Of course there are many,many more of these triples, but remember these for your SAT will be helpful.
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