Smith, David Eugene, 1860-1944 · Boston, New York [etc.] Ginn and Company · leaf 198
BOOK I AXD ITS PROPOSITIONS 187 Distances can easily be measured by constructing a large equilateral triangle of heavy pasteboard, and stand-ing pins at the vertices for the ^purpose of sighting. To measure PC, stand at someconvenient point A and sight alongAPC and also along AB. Thenwalk along AB… … Another simple method of measuring a distance ACiicross a stream is shown in this rio-ure. Measure the angle CAX,either in degrees, with a pro-tractor, or by sighting along apiece of paper and markingdown the angle. Then go alongXA produced until a point B isreached from which BC makeswith A an…
Geometry
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