A Neighboring Triangle

Geometry Level 3

Given that :

  1. \(\triangle ABC \) is an isosceles triangle, with \(AB=AC\).
  2. \(\triangle ADC\) is an isosceles triangle, with \(DA=DC\).
  3. \(\angle BAC = 100^\circ\)
  4. \(\angle DAC = 20^\circ\)

What is the measure of \(\angle ABD\) in degree?

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