Smith, David Eugene, 1860-1944 · Boston, New York [etc.] Ginn and Company · leaf 306
ed from being wreckedby the principle involved inthis proposition. If a dangerous shoal A is neara headland //, the angle HAX ismeasured and is put down uponthe charts as the vertical danger angle. Ships coining near theheadland are careful to keep far enough away, say at S, so thatthe angle HSX… … 296 THE TEACHING OF GEOMETRY three stays are needed, and they are preferably placedat the vertices of an equilateral triangle, the smoke-stack being in the center. The practical problem maybe given of locating the vertices of the triangle and offinding the length of each stay. Theorem. Two straight…
Geometry
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