I believe you mean, “The square of the longest side of a right triangle is equal to the sum of the squares of the remaining two sides.”
Or alternatively, “The square of the longest side of a triangle is equal to the sum of the squares of the remaining two sides, minus twice the product of those two sides and the cosine of the angle between them.”
I believe you mean, “The square of the longest side of a right triangle is equal to the sum of the squares of the remaining two sides.”
Or alternatively, “The square of the longest side of a triangle is equal to the sum of the squares of the remaining two sides, minus twice the product of those two sides and the cosine of the angle between them.”