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Published online by Cambridge University Press: 20 January 2009
Parallel to sides.
(a) Let O and 0' be two reciprocal points,
DE(α), FG(β), HI(γ) the intercepts made on the sides by lines drawn parallel to the sides through O;
D'E'(α'), F'G' (β'), H'I' (γ') similar intercepts for O'.