Industrial drawing and geometry; an introduction to various branches of technical drawing (1911)
Spooner, Henry John, 1856- · London, New York [etc.] Longmans, Green, and co. · leaf 38
Fig. 65. Fig. 66. Fig. 67. Fig. 68. Sum of the three sides. - The angle at the centre is always twice the angle at the circumference; thus PJI (Pig. 66) is twice FGI (Euc. III. 20). This angle is always the complement of the vertical angle (Euc. III. 20). 20 INDUSTRIAL DRAWING AND GEOMETRY…
Mechanical drawing · Geometrical drawing
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