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By definition, a rectangle is a four-sided figure with four right-angle corners. Which of these expresses this definition as a biconditional statement?

A .A quadrilateral is a rectangle iff it has four 90º angles.

B. Once a quadrilateral has four 90º angles it has become a rectangle.

C. Quadrilaterals are rectangles when they have four 90º angles.

D. A rectangle is a quadrilateral with four 90º angles.

2 Answers

4 votes
The correct answer is D
User Chris Conover
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A. Biconditional statements always take the form of "<hypothesis 1> if and only if (iff) <hypothesis 2>".
User Akshay Rawat
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