A 13 Foot Ladder Is Leaning Against A Wall. X^2+12^2=13^2 this is a pythagorean triplet that you should know 5,12, 13 right triangle. Mathematics · 1 decade ago.
• we have to find the height of the point where the ladder touches the wall.
The foot be moving away from the wall when the top is 9 feet above the ground? L = 13, (dy/dt)=2, y =5. A ladder leaning against a wall makes an angle of 60° with the horizontal. The ladder's length doesn't change, but it's distance in relation to the wall does when the ladder slips down.