12. The following figure shows a quadrilateral in
which sides AB and DC are parallel.
If ZA: ZD = 4:5, ZB = (3x - 15)°
and ZC = (4x + 20°, find each angle of the
quadrilateral ABCD.
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Step-by-step explanation:
∠A + ∠D = 180° [AB||DC]
∠B + ∠C = 180° [ AB||DC]
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