the formula is A^2 + b^2 = c^2 A & B being the sides, and C being the hypotenuse.
The pythagoreom theorem is just a formula, used to find the sides of a right triangle
a^2+b^2=c^2
A is one side in a triangle
B is the other side
C is the hypoteneuse, i.e. the side opposite of the 90 degree vertex
plug in each variable, square them, and it should be equal