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 65
CHAPTEE IV INSCEIBED AND DESCKIBED FIGURES Problem 49. To inscribe an equilateral triangle in a given cirele ABC. Pind the centre E (Prob. 33), and draw the diameterDC. With D as centre, and DE as radius, mark off the pointsA and B on the circumference of the circle. Join AB, BC,and CA. Then ABC… … Problem 50. To deseribe an egidlateral triangle ahont a given eirele ABC. At the points A, B, and C draw tangents to the circle (Prob.84), and produce them till they meet in the points P, G-, and H.Then the equilateral triangle PGH will be described about thecircle ABC, as required. CHAP. IV…
Geometrical drawing
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