21. Sometimes a................can be a square.
22. The diagonals are perpendicular in a
23. The diagonals of a quadrilateral are congruent but do not bisect each other. This quadrilateral is
24. The diagonals of a rhombus are
25. The diagonals of a trapezium are
26. The diagonals of a trapezium are not perpendicular.
27. The figure formed by joining the mid-points of the sides of a quadrilateral ABCD, taken in order, is a square only, if
28. The figure obtained by joining the mid-points of the sides of a rhombus, taken in order, is
29. The quadrilateral formed by joining the mid-points of the side of quadrilateral PQRS, taken in order, is a rhombus, if
30. The quadrilateral formed by joining the mid-points of the sides of a quadrilateral PQRS, taken in order, is a rectangle, if
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