This question identifies shapes with curved edges versus straight edges.
Look for curves in the outline. Only curved edges count.
Shapes can be classified by the nature of their edges. Circles and semicircles have curved edges, while rectangles and squares have straight edges. Recognizing curved edges is important in perimeter calculations and design problems. Practice with different shapes helps quickly distinguish edge types, which also affects area and perimeter computations. Real-world applications include wheels, arches, and circular designs.