Which polygon has three sides and three interior angles?

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

Answer: (A)

Recognizing shapes by how many sides and angles they have helps you identify the figure. A polygon with three sides must be a triangle, and a triangle has three interior angles. In fact, the angles of a triangle sum to 180 degrees. The name triangle comes from tri- meaning three and angulus meaning angle. The other described shapes have more sides: a four-sided polygon is a quadrilateral, a five-sided polygon is a pentagon, and a six-sided polygon is a hexagon.