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A ladder rests against a vertical wall a...

A ladder rests against a vertical wall at angle `alpha` to the horizontal . If is foot is pulled away from the wall through a distance 'a' so that it slides a distance 'b' down the wall making the angle `beta` with the horizontal , then a =

A

`a=b" tan"(alpha+beta)/(2)`

B

`a=b" cot"(alpha+beta)/(2)`

C

`a" tan(alpha-beta)/(2)`

D

None

Text Solution

Verified by Experts

The correct Answer is:
A
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