12.The sum of angles of a concave quadrilateral is
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360°
No. of Angles of a concave quadrilateral is 360°. It does not matter whether the quadrilateral is concave or convex, the sum of all the four angles present in the concave or the convex quadrilateral is always 360°. angles of any quadrilateral is measured then it is done by breaking the quadrilateral into two triangles.
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