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Model gun enthusiasts often take part in competitions to see which of their model guns will go the furthest. During a test firing, a rocket was propelled vertically. The angle of elevation to the maximum height reached was determined from two points 20m apart, on the same side of the launch site and in a straight line with it. The angles determined from these two points were 66 and 37. How high was the rocket propelled, to the nearest metre?