Projective geometry for use in colleges and schools (1911)
Milne, William P. (William Proctor), 1881- · London : Macmillan · leaf 107
Fig. 37. Reciprocate the following figure : The description of the figure is, a and h are twolines whose point of intersection lies on the conic S. … Fig. 38. The description of the Dual (or Reciprocal) Figurewould therefore be, A and B ai^e two points whosejoin touches the conic S\ RECIPROCATION. THE PRINCIPLE OF DUALITY 87 Example 3. Reciprocate the figure:
Geometry, Projective
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