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INeedGoodGrades
its A because 5 squared = 25 and 12 squared = 144 so 144+ 25= 169. 
169=13 squared so its 13 or A

s.a: A
You're trying to find the longest side of a right triangle, also known as the hypotenuse. The formula used is called the Pythagorean Theorem.
a^2+b^2=c^2
5^2+12^2=c^2
25+144=c^2
169=c^2
13=c

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