Question

A quadrilateral with all four sides equal and four angle of 90°is called
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Answer 1

IF a parallelogram has an angle of 90 degrees (thus all 4 angles are 90) it is a rectangle - all rules of parallelograms apply plus diagonals are congruent. IF a parallelogram has 4 equal sides, then it is a rhombus. All parallelogram rules apply plus the diagonals are perpendicular bisectors of each other.

Please mark me as brillant.................