In a quadrilateral ABCD, angle A = 60, angle B= 135 and angle C = 105 degrees, so that AC = BD. Prove that .This entry contributed by Sumith Peiris, Moratuwa, Sri Lanka.
See also: Geometry Problems 1281-1290 Visual Index Open Problems All Problems Triangle Quadrilateral Congruence Angles 90 degrees 60 degrees 135 degrees
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