Question

A man standing directly opposite to one side of a road of width x meter views a circular shaped
traffic green signal of diameter 'a' meter on the other side of the road. The bottom of the green
signal is b meter height from the horizontal level of viewer's eye. If A denotes the angle subtended
by the diameter of the green signal at the viewer's eye, then prove that
A = tan^-1(a+b/x)-tan^-1(b/x)​

Answer 1

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