Question

The length of a ladder is exactly equal to the height of the wall it is resting against. If
lower end of the ladder is kept on a stool of height 3 m and the stool is kept 9 m away
from the wall, the upper end of the ladder coincides with the top of the wall. Then,
the height of the wall is:
(1) 12 m (2) 15 m (3) 18 m (4) 11 m

Answer 1

use pythagoras on triangle

Answer 2

ok - can you continue from here?

Answer 3

Yes, comes to 15

Answer 4

right