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 179
ft. long, to the corner of a shed intthe form of an equilateral triangle, side 20 ft.: find area over which itmay graze outdide of the shed. Solution. (1) Let ABC be the shed. (2) The goat can graze with the 30 ft. cord over a cir-cle, except a sector of60°, or angle A. (3) EMD=300°, or JU=f oi a… … FIG. 39. MENSURATION. 165 (7) Whole area grazed over is 2356.2 sq. ft.+209.44 sq. ft.=2565.64 sq. ft. PROBLEM 349.At 80 cents a rod, what would be the cost of fencing- a field in theform of an equilateral triangle, its altitude being 6 rd.? Solution. (1) Let ABC be the triangle. (2) AO bisects the…
Arithmetic · Geometry
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![An illustration from Nicolai Copernici Torinensis De reuolutionibus orbium coelestium, libri VI : Habes in hoc opere iam recens nato, & aedito, studiose lector, motus stellarum, tam fixarum, quàm erraticarum, cum ex ueteribus, tum etiam ex recentibus obseruationibus restitutos: & nouis insuper ac admirabilibus hypothesibus ornatos. Habes etiam tabulas expeditissimas, ex quibus eosdem ad quoduis tempus quàm facillime caculare poteris. Igitur eme, lege, fruere. [Line in Greek] (1543)](https://img.insideoutlibrary.com/img/200/ia-nicolaicopernici00cope-215-131.webp)
