3/12+9/17-8/28 ka Naam kya hoga
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a person is standing at one of the corner of a squarical field he observed that the angle of elevation to the top of a pole situated on the exactly opposite diagonally to him is of the 60 degree.from this corner he goes back 80 meter along a straight line he found that this angle become a 30 degree. what is the length of the ground
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