posted by THAMI .
A LADDER IS LEANING AGAINST THE WALL. IF THE LADDER REACHES A HEIGHT OF 12M UP THE WALL AND HAS ITS FOOT 5M AWAY FROM IT ,CULCULATE THE LENGTH OF THE LADDER?
surely you are familiar with the 5-12-13 Pythagorean triple?
The length of the ladder is √(5^2+12^2) = 13