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On the quadrilateral circuminscribed to two circles
Published online by Cambridge University Press: 20 January 2009
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Let ABCD be a quadrilateral inscribed in a circle (centre O, radius ρ) whose diagonals AC, BD intersect at right angles in S. From S draw SE, SF, SG, SH perpendiculars on AB, BC, CD, DA respectively.
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- Copyright © Edinburgh Mathematical Society 1903
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