What defines a rectangle?

A rectangle is specifically defined as a quadrilateral that has four right angles. An important property of rectangles is that the diagonals are congruent, meaning they are equal in length. Therefore, the statement that a rectangle has four right angles and congruent diagonals accurately captures these defining characteristics.

In contrast, while all sides being equal describes a square, it does not define a rectangle. A rectangle also cannot be defined by having one pair of parallel sides, as all quadrilaterals have at least one pair of parallel sides due to their geometry. Lastly, the property that diagonals bisect each other perpendicularly pertains to rhombuses and is not a defining trait of rectangles. Thus, the chosen statement effectively highlights the unique aspects of rectangles among quadrilaterals.