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 180
, Ihave a regular triangle, called anequilateral triangle. Join AD, thenADB is a right triangle. Then OD=DB._ _ AB8=ADa—DB8=4AOa—AO», or(DB8)=3AO*. Whence AB=AOV3;that is,the side of an equilateral tri-angle is equal to the radius of the cir-cumscribing circle multipied by the PIG. 41.square root… … 166 FAIRCHILDS SOLUTION BOOK.
Arithmetic · Geometry
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