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Keegan says that a quadrilateral is a square if and only if it is a rectangle. Is this a true biconditional statement?
Yes, because all squares are rectangles.
Yes, because all rectangles are squares.
No, because all squares are not rectangles.
No, because all rectangles are not squares.
The correct answer is: No, because all rectangles are not squares.
Explanation: While it’s true that all squares are rectangles (since they have four right angles), not all rectangles are squares. A rectangle can have sides of different lengths, whereas a square has all sides equal. Therefore, the statement is not true as a biconditional because it does not hold in both directions.