FTCE General Knowledge Math Practice Test

Which figure is a square?

1. A rectangle with unequal sides

2. A rhombus with right angles

3. A trapezoid with equal nonparallel sides

4. A parallelogram with one obtuse angle

The correct answer is: A rhombus with right angles

The correct answer is a rhombus with right angles. A square is defined as a quadrilateral that has all sides equal in length and all angles equal to 90 degrees. A rhombus possesses the property of having all sides equal, and when it also has right angles, it meets the definition of a square. The first option describes a rectangle with unequal sides, which does not meet the criteria for a square, as a square requires equal side lengths. The third option presents a trapezoid, which typically has only one pair of parallel sides, and does not conform to the specific requirements of a square. The last choice describes a parallelogram with one obtuse angle, which cannot be a square since a square must have four right angles. Thus, the rhombus with right angles is indeed a square.