What is a Solid?

An edge is where two planes intersect to form a line
A face is a flat surface on the solid
A face at the top or bottom of the solid is called a base
A vertex is where three or more planes intersect to form a point
A cylinder has two circular bases
A pyramid has only one base
Solids can be named more specifically by the shape of the base
A prism has two identical and parallel bases, so our first solid was a rectangular prism

1. Intersecting means the planes cross each other
2. Dimensions are aspects of the solid that we can measure
1. Our example solid has 12 edges
1. A flat surface is one that lies in a two-dimensional plane
2. Our example solid figure has six faces
1. A base is a specific type of face
2. Our example solid has two bases, one on the bottom and another on the top
1. Because we're dealing with three dimensions, a vertex will be where three or more planes cross each other
2. Our example solid has 8 vertices (which is plural for vertex) - these are the corners of the solid
1. 3-D stands for three-dimensional
2. The solid we already looked at is a rectangular prism
3. A cylinder always has two circular bases
4. A pyramid has one base and the other faces meet at the same vertex
5. A triangular prism has rectangular faces like the first solid we looked at, but the two bases are triangles
6. Solids can be named more specifically by the shape of their base, like rectangular pyramid or triangular prism

What is a solid?