[" 11.Show that the quadrilateral formed by joining the mid-points of "],[" sides of a square is also a square."]

Show that the quadrilateral, formed by joining the mid-points of the sides of a square, is also a square.

Show that the quadrilateral, formed by joining the mid-points of the sides of a square is also a square.

Show that the quadrilateral, formed by joining the mid-points of the sides of a square is also a square.

Show that the quadrilateral, formed by joining the mid-points of the sides of a square is also a square.

Show that the quadrilateral,formed by joining the mid-points of the sides of a square,is also a square.

Prove that the quadrilateral formed by joining the mid-points of the sides of a square is also a square.

Prove that the quadrilatral formed by joining the mid points of the sides of a quadrilateral is a parallelogram.

Prove that the quadrilateral formed by joining the mid-points of the sides of a rectangle is a rhombus, but not a square.

The diagonals of a quadrilateral A B C D are perpendicular. Show that the quadrilateral, formed by joining the mid-points of its sides, is a rectangle.