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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
(5) V 7056=84 sq. ft., area of ABC. … FIG. 4<>. Bui©.—Add the three sides together and take half the sum; fromthe half sunt subtract each side separately; multiply the half sumand the three remainders together and extract the square root of theProduct. NoTK.—The demonstration of this rule can be found in any g-oodgeometry.…Arithmetic · Geometry
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