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From the top of a hill 240m high the ang...

From the top of a hill 240m high the angle of depression of the top and of the bottom of a pole are `30^@` and `60^@`, respectively. The difference (in m) between the height of the pole and its distance from the hill is :
एक पहाड़ी के शीर्ष जो 240 मीटर ऊँचा है| से एक खम्भे के ऊपर और निचे के तल पर कोण क्रमश `30^@` और `60^@` है। खम्भे की ऊँचाई और पहाड़ी से उसकी दूरी के बीच का अंतर (m) है

A

`80(2-sqrt3)`

B

`120(sqrt3-1)`

C

`120(2-sqrt3)`

D

`80(sqrt3-1)`

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