Question

Angle sum property of a concave quadrilateral by practical

Answer 1

Answer:

As with any simple polygon, the sum of the internal angles of a concave polygon is π (n − 2) radians, equivalently 180°×(n − 2), where n is the number of sides. ... An example of a concave quadrilateral is the dart. At least one interior angle does not contain all other vertices in its edges and interior.