Answer: A) pythagorean theorem
Step-by-step explanation:
You are probably familiar with the formula
which is the pythagorean theorem.
The
is the square of the first leg 'a', while
is the square of the second leg b. Adding those two squares leads to the square of the hypotenuse c, aka
. This only works with right triangles, which are triangles that have a 90 degree angle.