Posted by Kathy on Sunday, December 12, 2010 at 11:31pm.
Given: obtuse triangle ABC with obtuse angle B. Point D on side AC such that angle BDC is also obtuse. Angle DAB is 2/3 of angle ABD. Angle BCD is 1/5 angle BDC and angle CBD is 4 more than angle BAD. What is the measure of angle ABC?

Geometry  Ann, Sunday, May 8, 2016 at 4:08pm
½ m ےABC =½ m ےPQR
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