The definition states that a quadrilateral that is circumscribed in a circle is called a cyclic quadrilateral. It means that all the four vertices of the quadrilateral lie on the circumference of the circle.
In a cyclic quadrilateral, the opposite angles add up to .
It has all vertices on a circle.
It's sometimes referred to as an inscribed quadrilateral.
A circumcircle also called a circumscribed circle that contains all of the vertices of any polygon on its perimeter.
Hence, The quadrilateral formed within a circle is known as a cyclic quadrilateral.
