Which of the following shapes always has right angles?

• A. Square
• B. Rhombus
• C. Trapezoid
• D. Parallelogram

Answer: (A)

A square is a specific type of quadrilateral that always has right angles. By definition, all four interior angles of a square measure 90 degrees. This characteristic is a fundamental property of squares, making them unique among quadrilaterals.

While other shapes like parallelograms and rhombuses can have right angles, they do not necessarily have them. For example, a rhombus has equal side lengths but can have angles that are not 90 degrees. Similarly, a parallelogram has opposite angles that are equal but does not require all angles to be right angles. A trapezoid may or may not have right angles as well, depending on the specific type.

In summary, the square is the shape that consistently exhibits right angles, which is what makes it the correct answer in this context.