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computational in trapezoid, BC = 2 DA, <DAB + <ABC =120^o 2001 Portugal p2

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October 13, 2020
geometrytrapezoid

Problem Statement

The trapezium [ABCD][ABCD] has bases [AB][AB] and [CD][CD] (with [AB][AB] being the largest base). Knowing that BC=2DABC = 2 DA and that ∠DAB+∠ABC=120o\angle DAB + \angle ABC =120^o , determines the measure of ∠DAB\angle DAB.
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