## Mathematical Questions and Solutions, Volume 69 |

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### Contents

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AABC Allan Cunningham axes axis B.A. Let bisects centre centroid chord circonference circonscrit circumcentre circumcircle coefficient coniques const constant cos2 cosC Cullen curve determinants deux diameter digit directrix draw ellipse equal equation factors foci focus given point given triangle H. J. Woodall H. W. Curjel Hence hyperbola incircle inscribed integer integral intersection isogonal conjugate joining locus meet mid-points multiplier neuf points nine-point circle orthocentre parabola parallel perpendicular polar prime Prof Professor Sanjana Proposer prove quadrilateral radical axis radius ratio respectively right angles roots sides Similarly SimsOn-line sin2 Solution by H. W. Solution by Lionel Solution by Professor Solution by Rev solves the Question square stream lines symmedian tangent theorem triangle ABC triangle formed values vanish W. C. Stanham W. E. Jeffares whence