Question

A $15$ $m$ long ladder reached a window $12$ $m$ high from the ground on placing it against a wall at a distance a. Find the distance of the foot of the ladder from the wall.

Answer 1

As we know, it form a right-angled triangle,

therefore, the distance of the foot of ladder from the wall can be calculated by Pythagoras theorem,

Let the distance of foot of ladder from wall be $x$

$x=\sqrt{(15{)}^2-(12{)}^2}$

$x=9m$