Smart, Edward Howard · London : Macmillian and Co. · leaf 299
each of these lines may be looked upon as the join of avertex to the point at infinity on the opposite side, and thisjoin subtends a right angle at O. By §7, the reciprocal of such a line is the point of inter-section of a side of the reciprocal triangle with the perpen-dicular on it from the… … Pio. 132. perpendiculars from the vertices on the opposite sides of thetriangle, i.e. the nine-points circle of the triangle. Examples on Chapter XVIII. 1. Reciprocate the theorems : (a) The angle between a tangent to a circle and anj chord tliroughits point of contact is equal to the angle in the…
Geometry, Projective
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