Perspective and geometrical drawing : adapted to the use of candidates for second and third-class teachers' certificates (1887)
McGuirl, Thos. H. (Thomas H.) · Toronto, Ont. : W. Briggs · leaf 117
making HG equal to part produced ; bisectthis line by KL, which will also be a tangent at point H. IfAC be produced, the line FC, perpendicular to the tangent atthe point of contact C, is called a normal. (Fig. 79.) (b) To draw a tangent to a circle from an external point.Join point with centre,… … Let AD be the given altitude ; at A and D draw perpen-diculars, and with A as centre and any distance describe anarc EF ; with D as centre and any distance less than DAdescribe an arc to cut arc in E and F ; join AE and AF, andproduce them to base, forming isosceles triangle ABC. (Fig.80.) No.…
Geometrical drawing · Perspective
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