A $ 6 \mathrm{~m} $ long ladder leans on a wall to reach the height of $ 3.6 \mathrm{~m} $ on the wall. Find the distance of the lower end of the ladder from the wall.

Given: 

A \( 6 \mathrm{~m} \) long ladder leans on a wall to reach the height of \( 3.6 \mathrm{~m} \) on the wall.

To do: 

We have to find the distance of the lower end of the ladder from the wall.

Solution:

Let $AB$ be the ladder and $AC$ be the wall.

$BC$ is be the distance between the wall and the foot of the ladder.

Therefore,

$AB=6\ m$

$AC=3.6\ m$

In $\vartriangle ABC$, using Pythagoras theorem,

$AB^2=AC^2+BC^2$

$\Rightarrow ( 6)^2=( 3.6)^2+BC^2$

$\Rightarrow 36=12.96+BC^2$

$\Rightarrow BC^2=36-12.96$

$\Rightarrow BC^2=23.04$

$\Rightarrow BC=\sqrt{23.04}$

$\Rightarrow BC=4.8\ m$

The distance between the wall and the foot of the ladder is $4.8\ m$. 

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Updated on: 10-Oct-2022

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