Problem

In concave quadrilateral ABCD, the angle at A measures 40°. ∆ABD is isosceles, bisects ∠A...

In concave quadrilateral ABCD, the angle at A measures 40°. ∆ABD is isosceles, bisects ∠ABD, and bisects ∠ADB. What are the measures of ∠ABC, ADC, and ∠1?

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