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The following figure shows a quadrilater...

The following figure shows a quadrilateral in which sideo AB and DC are parallel. If `angleA : angleD= 4:5, angleB= (3x - 15)^@ and angleC=(4x + 20)^@,` find each angle of the quadrilateral ABCD.

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The correct Answer is:
`angleA=80^@, angleB=60^@, angleC=120^@ and angleD=100^@`
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