Question

a ladder 13 metre long when set against the wall of a house just reaches a window at the height of 12 m from the ground. How far is the lower end of the ladder from the base of the wall? pls answer plsss​

Answer 1

By the Pythagorean formula for a right triangle, ie,

a^2 + b^2 = c^2

where c is the hypotenuse of the triangle

12^2 + b^2 = 13^2 or

144 + b^2 = 169 or

b^2 = 169 - 144 or

b^2 = 25 therefore

b = 5

The foot of the ladder is 5 m from the wall.