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 126
lateral triangle equal in area to a giventriangle ABC. On one side of the given triangle, CB for example, construct PROPORTIONAL AND EQUIVALENT AREAS 105 an equilateral triangle CBD (Prob.16). From the point A drawthe line AE parallel to CB till itmeets CD produced in E (Prob. 4).Bisect the line ED… … Fia:. 228. Problem 146. Another method. Let ABC be the given triangle. Convert it into an isosceles triangle (Prob. 124). Drawthe line DE perpendicular toAB (Prob. 5). On the base ABconstruct the equilateral triangleABH (Prob. 16). Bisect DEin G (Prob. 1). With G ascentre, and GD as radius, drawthe…
Geometrical drawing
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