3^2=9
4^2=16
9+16=25 =5^2
You can write 3^2+4^2=5^2
(3,4,5) form a Pythagorean triple.
If you construct a right triangle with legs =3 and 4, the hypotenuse will be 5, because in a right triangle the Pythagorean theorem holds true.
It says (leg_1)^2+l(leg_2)^2=(hypotenuse)^2
Other Pythagorean triples are (5,12,13), (9,40,41)
Here is a link to more info on Pythagorean triples
Pythagorean Triples Advanced
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