1. The problem states: "All have 4 edges." We need to understand what this means in a mathematical or geometric context. 2. In geometry, an edge is a line segment joining two vertices in a polygon or polyhedron. 3. A shape with 4 edges is typically a quadrilateral if it is a 2D polygon. 4. Quadrilaterals have 4 sides (edges) and 4 vertices. 5. Examples include squares, rectangles, trapezoids, and rhombuses. 6. If the problem is about identifying or confirming shapes with 4 edges, then all such shapes are quadrilaterals. Final answer: All shapes with 4 edges are quadrilaterals.