A ladder 20m long is kept inclined to reach a window 16m high. How far from the wall should the foot of the ladder rest?
Answer
12 metres.
Steps
Distance of the leader's foot from wall. =
Sqrt ((20)^2 - (16)^2)
= sqrt ((20+16)(20-16)) using (a)^2-(b)^2
= sqrt(36×4)
= sqrt (144)
= 12 metres.
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