Task: Question Answering
Input (English): passage: In geometry, a square is a regular quadrilateral, which means that it has four equal sides and four equal angles (90-degree angles, or (100-gradian angles or right angles). It can also be defined as a rectangle in which two adjacent sides have equal length. A square with vertices ABCD would be denoted ◻ (\displaystyle \square ) ABCD.
 question: does a square have to have right angles?
Output (English): Yes