Question

A 13 meters long ladder,when set against a wall of a house reaches a height of 5 meters. How far is the foot of ladder from the wall

Answer 1

Its easy.

This can be solved using pythagrorus theorem..

Answer is 12..

Cheers

Answer 2

length of the ladder=13 meters
the length of the wall where the ladder attached =5 meters
then the length from the foot of ladder to wall =

$\sqrt{13 {}^{2} - 5 {}^{2} } = \sqrt{144} = 12 \: \: meter$