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Question

A ladder 20 m long is placed against a vertical wall of height 10 metres. Find the distance between the foot of the ladder and the wall and also the inclination of the ladder with the ground.


A

10 m,

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B

10 m,

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C

5 m,

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D

None of these

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Solution

The correct option is A

10 m,


Let x = AB = 10m, is the wall

AC is the ladder which is 2x of wall i.e. 20m

sin c = ABAC = 12

C = 30

Hence the ladder is inclined 30 to the ground

Distance between foot of the ladder and wall = BC = 103 m.


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