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 127
Pkoblem 148. To construct a triangle one-fifth the area of a sirailartriangle ABC. Produce the line AB to D, making DA equal to one-AB (Prob. 10). Bisect DB inF (Prob. 1), and with F as centreand FD as radius, draw the semi-circle DEB. At A erect AEperpendicular to AB (Prob. 7).AE is the mean… … 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…
Geometrical drawing
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