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 187
. (2) 12 ft. = altitude. (3) (20X12)^=120 sq.ft. .*. 120 sq. ft.=area of the tri-angle ABC. FIG. 48 Bulo.—Multiply the base by the altitude and take half the product. PROBLEM 361. Find the area of a triangle whose sides are 13, 14 and 15 ft. respec-tiyely. Solution. (1) 13 ft.+14 ft.H-15 ft.=42… … (5) V 7056=84 sq. ft., area of ABC.
Arithmetic · Geometry
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