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Suppose a lighthouse is built on the top of a rock; the distance between a place of observation and that part of the rock level with the eye is 620 yds; the distance from the top of the rock to the place of observation is 846 yds; and from the top of the lighthouse, 900 yds. Find the height of the lighthouse. (Ticknor, The Columbia Calculator, 1846)
Click here to reveal the answer
"Height of the Lighthouse," Loci (March 2006)