I am in year 10 and we are doing about pythagoras theorem in class and i have trouble remembering it.

In mathematics, the Pythagorean theorem, also known as Pythagoras' theorem, is a fundamental relation in Euclidean geometry among the three sides of a right triangle. It states that the square of the hypotenuse (the side opposite the right angle) is equal to the sum of the squares of the other two sides.

a^2 + b^2 = c^2

Just remembering that triangles have 3 sides, that's the basics, right?

next think of a + b = c in your brain, easy?

then add the square to each term

a^2 + b^2 = c^2 complete :D

Hope this can help you