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Q.

A ladder 25 m long reaches a window of building 20 m above the ground. Determine the distance of the foot of the ladder from the building.

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a

20m

b

25m

c

15m

d

14m

answer is C.

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Detailed Solution

Question Image

From Pythagoras theorem ,

AB2=AW2−WB2

=252−202

∴AB=15 m

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A ladder 25 m long reaches a window of building 20 m above the ground. Determine the distance of the foot of the ladder from the building.