4.(iii) Rewrite the following statement in the form “p if and only if q”
(iii) r: If a quadrilateral is equiangular, then it is a rectangle and if a quadrilateral is a rectangle, then it is equiangular.
The statement in the form “p if and only if q” is :
A quadrilateral is equiangular if and only if it is a rectangle.
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