Question

A ladder is placed that the lower end is 5 M from the wall and upper end is upto a window which is 12 m from the ground what is length of ladder.

Answer 1

13M length of ladder

Answer 2

The length of the ladder is
$ab { }^{2} + bc {}^{2} = ac { }^{2} \\ 5 { }^{2} + 12 {}^{2} = ac {}^{2} \\ 25 + 144 = ac { }^{2} \\ 169 = ac {}^{2} \\ ac = \sqrt{169} \\ ac = 13$
The length of the ladder is 13m