Science and art drawing : complete geometrical course ; consisting of plane and solid geometry, orthographic and isometric projection, projection of shadow's the principles of map projection, graphic arithmetic and graphic statics (1895)
Spanton, J. Humphrey (John Humphrey) · London : Macmillan · leaf 128
Problem 149. Construct a rectangle one-third the area of a similarrectangle ABC. Produce the line AB to E, making AE equal to one-third PROPORTIONAL AND EQUIVALENT AREAS 107 of AB (Prob. 10). Bisect EB in H (Prob. 1). With H ascentre, and HE as radius, draw the semicircle EKB. From Adraw the line… … mean proportional between the lines EA and AB. Join AD,Make AL equal to AK, Draw LIST perpendicular to AB till itmeets AD in K From N draw NM parallel to AL, ALNMis the rectangle required. Peoblem 150, To construct a regiilar polygon three-fourths the area of a similarpolygon, e.g. a hexagon.
Geometrical drawing
Internet Archive · Wellesley College Library · Public Domain Mark 1.0. Free to use for anything.
