A complete and practical solution book for the common school teacher (1899)
Fairchild, J[ohn] T[heodore] [from old catalog] · Crawfis College, Ohio, The author · leaf 227
212 FAIRCHILDS SOLUTION BOOK. (4) The area of the field is 64X50, or 3200 sq. id. (5) APED=£ of the field, and PBCF=| of the field. (6) The triangle EPF=|—J=* of the field, or \of 3200 sq. rd.=533jsq. rd. (7) Since DA=50 rd., EF=(533£X2)-^50=21£rd. (8) EC=32 rd., half the side. (9) FC=CE=FE =… … FIG. 97. PROBLEM 420. There is a square field such that the number of rods around it isequal to the number of acres within it: how many acres does it con-tain? Solution. (1) Let ABCD be the square field. (2) O is the center of the field. (3) Draw OF perpendicular to AB. (4) FE=1 rd. (5) Join OE.…
Arithmetic · Geometry
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