select all the polyhedra.
select all the polyhedra.
Answer
Answer:
The first, third, and fourth - shaped objects (the rectangular prism, triangular prism, and the polyhedron with multiple flat faces).
Explanation:
Step1: Recall polyhedron definition
A polyhedron is a three - dimensional solid with flat polygonal faces, straight edges and sharp vertices.
Step2: Analyze each object
The rectangular prism has flat rectangular faces, straight edges and vertices, so it's a polyhedron. The cylinder has curved surfaces, so it's not a polyhedron. The triangular prism has flat triangular and rectangular faces, straight edges and vertices, so it's a polyhedron. The fourth object with multiple flat faces, straight edges and vertices is also a polyhedron.