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What is a rectangle?

  1. A polygon with no right angles

  2. A parallelogram with one right angle

  3. A polygon with four sides of equal length

  4. A simple three-dimensional figure

The correct answer is: A parallelogram with one right angle

A rectangle is defined as a parallelogram in which each of the four angles is a right angle (90 degrees). While it is true that a rectangle is a specific type of parallelogram, it is particularly characterized by having all angles equal to 90 degrees. The description of a parallelogram with one right angle matches the property that if one angle is a right angle, then all angles must be right angles due to the properties of parallelograms. Thus, the correct answer captures the fundamental relationship between rectangles and parallelograms, reinforcing that rectangles not only have the property of being a parallelogram but also have specific angle measures. Rectangles also consistently have two pairs of opposite sides that are equal in length and parallel, a feature of all parallelograms.