Number of vertices of a quadrilateral is …………….

The Number of diagonals of a Quadrilateral is …………….

Number of sides in a Quadrilateral is ______

Sum of the angles in a quadrilateral is ……….

If A=(-3, 4), B(-1, -2), C(5, 6), D(x, -4) are the vertices of a quadrilateral such that area of DeltaABD=2["Area of "DeltaACD] then x=

The sum of four angles of a quadrilateral is

Number of vertices of cuboid=…………….

Given that the vertices A, B, C of a quadrilateral ABCD lie on a circle. Also angleA + angleC = 180^@ , then prove that the vertex D also lie on the same circle.