FTCE General Knowledge Math Practice Test 2026 – Complete Exam Prep

The correct response is indeed a triangle. A triangle is defined as a polygon with exactly three sides, three angles, and three vertices. This fundamental characteristic distinguishes it from other shapes such as rectangles, squares, and pentagons, which have four and five sides, respectively. Rectangles and squares are quadrilaterals, meaning they have four sides, while pentagons contain five sides. The triangle's unique structure forms the basis of many geometrical principles and properties in mathematics, making it an essential shape to understand in the field of geometry.