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In quadrilateral PQRS, /P:/Q:/R:/S = 3...

In quadrilateral PQRS, `/_P:/_Q:/_R:/_S = 3:5:9: 7`. Find all the angles of quadrilateral PQRS.

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The correct Answer is:
`/_P= 45^(@), /_Q= 75^(@), /_R= 135^(@),`
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