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A 18 m long ladder (whose foot is on the ground) leans against a wall making an angle of 60° with the wall. What is the height (in m) of the point where the ladder touches the wall from the ground?

A 18 m long ladder (whose foot is on the ground) leans against a wall making an angle of 60° with the wall. What is the height (in m) of the point where the ladder touches the wall from the ground? Correct Answer 9

Let AC is 18 m long ladder.

In ΔACB

cos 60 = BC/AC

⇒ 1/2 = x/18

∴ x = 9 m

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