A quadrilateral whose all sides are equal, opposite angles are equal and the diagonals bisect each other at right angles is a __________.
rhombus
The correct answer is (a) rhombus
Explanation
A rhombus is a special case of a parallelogram, and it is a four-sided quadrilateral. In a rhombus, opposite sides are parallel and the opposite angles are equal. Moreover, all the sides of a rhombus are equal in length.
Properties
For example, the quadrilateral is a rhombus as shown below,
Hence, the correct option is (a)