Respuesta :

xenia168

Answer:

Step-by-step explanation:

m∠ACB = m∠CBD = 90° ⇒ m∠CAB = 90° - 50° = 40° = m∠ABD ( Alternate interior angles )

m∠CBD = 90°

m∠CDB = 50 °

Ver imagen xenia168

Check the picture below, notice the tickmarks, both sides are equal and they make twin angles on the "base" side of the isosceles triangle.

Ver imagen jdoe0001

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