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 193
smaller semi-circles. Q. E. D. PROBLEM 370. May and Ruth were cutting- out tickets for a recital, from a pieceof cardboard, and the part remaining- was in the form of a segment ofa circle, the height and base measur-ing exactly 2 in. and 12 in. The girls,being mathematically inclined, set towork to… … MENSURATION. 179 triangles CDB and BDE are similar. (3) We have CD : DB::DB : DE, or 2 : 6::6 : DE, or DE— 18 in. (4) DE+DC = EC, or 20 in. .*. The diameter was 20 in. PROBLEM 371. Three equal circles touch each other externally, and thus encloseone acre of ground: what is the diameter in rods of…
Arithmetic · Geometry
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