Longest Side Square — Sum of the squares of the shorter sides.
The Greek Pythagoras found around 500 v. Chr. a law, which applies to all right triangles. The Pythagorean theorem is:
The area of the square across the largest side is equal to the sum of the areas of the squares across the two smaller sides.
For example, if you have a right triangle with side lengths 3 cm, 4cm,5cm, then
3² + 4² = 5²
3×3 + 4x 4 = 5×5
9 + 16 = 25
Many theorems of Greek geometry are derived from the "Elements", the textbook, the Euclid around 300 BC. wrote, came to us. This book was still in translation until before 60 Used in many of our schools for years.