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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Answer:
angle a=110.90°
". b=51.54°
". c=180.72°
". d=8
this is a answer
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