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TOT 321 1992 Spring O J2 isosceles trapezoid wanteed

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June 9, 2024
geometrytrapezoidIsosceles Trapezoid

Problem Statement

In trapezoid ABCDABCD the sides BCBC and ADAD are parallel, AC=BC+ADAC = BC + AD, and the angle between the diagonals is equal to 60o 60^o. Prove that AB=CDAB = CD.
(Stanislav Smirnov, St Petersburg)
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