Question

A 15 metre long ladder is rested against a wall such that the foot of the ladder is 12 meter away from the wall. How up on the upper and and of the ladder ?
(a) 6m (b)8m
(c)9m (c)10m

STEP BY STEP EXPLANATION PLEASE
If your answer comes 9m it is correct.
I only need explaination.​

Answer 1

Answer:

9m

Step-by-step explanation:

Using phytogarus rule

15^2=12^2+x

225-144=x^2

81=x^2

x=9