Which shape has exactly eight sides?

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

Answer: (D)

Identifying a polygon by how many sides it has. An eight-sided polygon is called an octagon. The name comes from octa- meaning eight and -gon meaning angle or side, so the term fits perfectly for a figure with eight edges. To check, count the straight edges around the shape; eight distinct edges equal eight sides. The other common polygons have five sides (pentagon), three sides (triangle), and six sides (hexagon), so they don’t meet the eight-side requirement. Therefore, the octagon is the shape with exactly eight sides.