Which polygon has exactly five sides and five interior angles?

• A. Pentagon
• B. Heptagon
• C. Hexagon
• D. Quadrilateral

Answer: (A)

Five-sided polygons have as many interior angles as they have sides, because each corner is an interior angle. A shape with five sides is called a pentagon, and it has five interior angles. The other names correspond to different numbers of sides: a heptagon has seven sides, a hexagon has six, and a quadrilateral has four. Since only the pentagon has both five sides and five interior angles, it’s the correct choice.