The upper 3//4^(th) portion of a vertica...

The upper` 3//4^(th)` portion of a vertical pole subtends an angle `"Tan"^(-1)(3//5)` at a point in the horizontal plane through its foot and at a distance 40 m from the foot . Given that the vertical pole is at a height less than 100m from the gound ,find its height .

20m

40m

60m

80m

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