Smith, David Eugene, 1860-1944 · Boston, New York [etc.] Ginn and Company · leaf 222
LEADING PROPOSITIONS OF BOOK II 211 Suppose X Y to be the edge of a sidewalk, and P a point in thestreet from which we wish to lay a gas pipe perpendicular to thewalk. From P swing a cord ortape, say 60 feet long, until it meetsXY at A. Then take M, the mid-point of PA, and swing MP aboutM, to meet…
Geometry
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