Final answer:
A heptagon has 7 sides, 7 vertices, and 7 edges. A nanogon has 9 sides, 9 vertices, and 9 edges. A hexahedron, or cube, has 6 faces, 8 vertices, and 12 edges.
Step-by-step explanation:
A heptagon has 7 sides, 7 vertices, and 7 edges. The term 'hepta' in Greek means seven, hence the name heptagon. It is a polygon with seven straight sides and angles.
A nanogon, on the other hand, is a shape with 9 sides, 9 vertices, and 9 edges. The term 'nano' refers to the numerical prefix 'nine.'
A hexahedron is a term often used to describe a cubic shape. It has 6 faces, 8 vertices, and 12 edges. The term hexahedron comes from the Greek words 'hexa' meaning six, and 'hedron' meaning face.