False. Cylinders and cones are not just polyhedrons with circular bases.
true
Pentagons can be symmetrical, but are not always so.
The space it occupies isn't symmetrical.
No but capital H is a symmetrical letter
A prism is a polyhedron.
No. Polyhedrons are any shape with multiple sides. A triangle and a prism are just two different kinds of polyhedrons.
Yes, an empty box is and No, polyhedrons don't have to be.
False. Cylinders and cones are not just polyhedrons with circular bases.
polyhedrons need flat face and edges, corners which cylinder cones don't have.
Polyhedrons
not all
Cone, cylinder.
polyhedrons need flat face and edges, corners which cylinder cones don't have.
1
tetrahedrons
All polyhedrons.