Spanton, J. Humphrey (John Humphrey) · London, Macmillan and Co., Limited; New York, The Macmillan Company · leaf 92
78 GEOMETRICAL DRAWING AND DESIGN. 121. To divide a right angle into five equal parts. … Let ABC be the rightangle. Divide BC in D, sothat BC : BD : : BD : DC(Prob. 116). With C ascentre, and CB as radius,describe the arc BE ; andwith B as centre, and BD asradius, describe the quadrantDF, cutting BE in E FE isone-fifth of the quadrant FD.Arcs equal to it set off onFD will divide it…
Geometrical drawing · Design · Drawing
Internet Archive · Wellesley College Library · Public Domain Mark 1.0. Free to use for anything.
