When is a rectangle a square?A.When its angles are right anglesB.When its sides are congruentC.When its sides are parallelD.When its angles are convex angles

Answer

A rectangle is a special case of a square. For a rectangle to specifically qualify as a square, it must meet the criteria of having all four sides of equal length, in addition to having right angles. Therefore, the correct answer is:

B. When its sides are congruent.

This means that all sides of the rectangle must be of equal length, making it a square. While a rectangle always has right angles (answer A), it does not necessarily mean it is a square unless the sides are also congruent. The other options (C and D) do not apply to the distinction between rectangles and squares.