The pythagorean theorem states that in a right triangle,the square of the hypotenuse tn a right triangle is equal to the sum of the squares of the second two sides. As an example, in a right triangle ABC right at A,the square of the hypotenuse [BC]=[AC]to the power 2+[AB]to the power two.
By rabih sariedden,grade 8A.

i keep on asking since i am only in 5th grade, what is the pythagorean theorem

Well know you know what is it

this was a typing mistake i meant:'"well know you know it"

i meant "now you know what is it"

do you learn this in math class?

yes plus other algebric lessons and many other geometry lessons