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The High Level Bridge is over 1 km long. From one point on the river, the angle of elevation of the top of the bridge is 62.6 degrees.

The High Level Bridge is over 1 km long. From one point on the river, the angle of elevation of the top of the bridge is 62.6 degrees. From a point 20m closer to the bridge, the angle of elevation of the top of the bridge is 72.8 degrees. How high is the bridge above the river, to the nearest metre?

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