Find the value of y.
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As we know that angle on a straight line is 180º.
Therefore,
Interior angle of quadrilateral will be connected to angle y will be (180º−y).
As we know that sum of all the interior angles of a quadrilateral is 360º.
Therefore,
115º+85º+97º+(180º−y)=360º
⇒180º−y=360º−297º
⇒y=180º−63º=117º
Hence value of y is 117.
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