Question

a ladder 13 m long rests against

Answer 1

We will solve this question by Pythagoras theorem

As shown in figure,

${13}^{2} = {5}^{2} + {x}^{2}$

$169 = 25 + {x}^{2}$

$169 - 25 = {x}^{2}$

$144 = {x}^{2}$

$x = 12 \: m$