Which shape features 10 sides?

The shape that features 10 sides is known as a decagon. In geometry, the term "deca-" is derived from the Greek word for ten, so when combined with the suffix "-gon," which refers to the number of sides in a polygon, it specifically indicates a polygon with ten sides. A decagon can be regular, where all sides and angles are equal, or irregular, where the sides and angles can vary in length and measure.

In contrast, the other shapes mentioned have different numbers of sides: a nonagon has nine sides, a pentagon has five sides, and a hexagon has six sides. Each of these shapes contributes to the broader understanding of polygon classifications based on the number of sides they possess. Thus, the identification of the decagon as the shape with ten sides is accurate and fundamental to geometric studies.