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 196
le of 60°, and the length of each tangent is 20in.: what is the diameter? Solution. (1) Let DB and AB, the tan- gents = 20 ft., and the an-gle ABD=60°. (2) The angle A is a right triangle because it isformed by a tangent andradius. (3) OB bisects the angle DBA; hence, angle ABO=30°, K1( 62 and… … PROBLEM 377.A horse is tethered from one corner of a square 20-acre field: howlong must the rope be so that it can graze over 20 acres outside the field? 182 FAIRCHILDS SOLUTION BOOK. (1) (2) Solution. Let AOCB be the field, and Othe point at which horse theis tied. Let R = OH, the radius or…
Arithmetic · Geometry
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