Yes, a circle can be circumscribed in quadrilateral.
A cyclic quadrilateral is a quadrilateral which has all its four vertices lying on a circle.
we know, If opposite angles of a quadrilateral add to 180 then it is called a cyclic quadrilateral and a circle can be inscribed in it.
In this case the opposite angles add upto 180 which shows that is it is a cyclic quadrilateral.
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