Write "a^2." The "a" is a variable representing a leg of a right triangle.
Write "+."
Write "b^2." The "b" represents the length of the second leg of a right triangle.
Write "=."
Write "c^2." The "c" represents the length of the hypotenuse, or the longest side of a right triangle.
Write a qualifying statement, such as, "In the case of a right triangle ..."
Add the following to the sentence: "... the sum of each leg squared ..."
Complete the theorem with the following phrase: "... is equal to the hypotenuse squared."