A quadrilateral has ......... vertices, no three of which are ....... .

A quadrilateral has ........ sides.

A quadrilateral has ........ angles.

A quadrilateral has ......... diagonals.

Definition a quadrilateral is called a convex quadrilateral if the line containing any side of the quadrilateral has the remaining vertices on the same side of it.

A quadrilateral has the vertices at the points (-4, 2), (2, 6) (8, 5) and (9, - 7). Show that the mid-points of the sides of the quadrilateral are the vertices of a parallelogram.

A quadrilateral has the vertices at the points (-4, 2), (2, 6), (8, 5) and (9, -7). Show that the mid-points of the sides of this quadrilateral are the vertices of a parallelogram

A quadrilateral has the vertices at the points (-4,2),\ (2,6),\ (8,5)\ a n d\ (9,-7) . Show that the mid points of the sides of this quadrilateral are the vertices of a parallelogram.

A diagonal of a quadrilateral is a line segment that joins two ........ vertices of the quadrilateral.