Storm's a' Brewin'

What is the perpendicular height of a cloud, whose angle of elevation are 35 degrees and 64 degrees, taken by two observers, at the same time, both on the same side of the cloud, and at the distance of 880 yards asunder, so placed that a vertical plane would pass through both their stations and the cloud?

A Treatise on the Art of Measuring, James Ryan, 1831

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