Smith, David Eugene, 1860-1944 · Boston, New York [etc.] Ginn and Company · leaf 110
cular to another lineAB, from a point P, consists in swinging a tape from P, cutting AB at X and I7, andthen bisecting XY by doubling the tape. This fixes thefoot of the perpendicular. 4. It is now possible to findthe area of a field of irregu-lar shape by dividing it intotriangles and trapezoids,… … 100 THE TEACHING OF GEOMETRY the results of different groups of pupils, or by drawinganother diagonal and dividing the field into other tri-angles and trapezoids. These are about as many types of field work as thereis any advantage in undertaking for the purpose of secur-ing the interest of pupils…
Geometry
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