MathDB
bisection in quad

Source:

November 9, 2006
geometry proposedgeometry

Problem Statement

A convex quadrilateral ABCDABCD is inscribed in a semicircle with diameter ABAB. The diagonals AC,BDAC,BD intersect at SS, and TT is the projection of SS on ABAB. Show that STST bisects angle CTDCTD.
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