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let length of thread is x ,
length of kite above building is 80-10= 70m
=> sin30° = 70/x
=> 1/2 = 70/x
=> x = 70×2 = 140 m
length of kite above building is 80-10= 70m
=> sin30° = 70/x
=> 1/2 = 70/x
=> x = 70×2 = 140 m
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