Area
The number of square units enclosed by the figure.
Units: Square inches, acres.
Perimeter
The sum of the length of the sides of a figure.
Units: meters, inches, etc.
Volume
The number of cubic units enclosed by a 3-D shape. The measure of the space occupied by a shape.
example: Cubic inches, Liters
Surface Area
The sum of the areas of the surfaces of a figure.
Net
A 2-dimensional pattern that can form a 3-dimensional shape.
Lateral Area
The sum of the areas of the sides of a figure.
The bases are not include.
Apothem
For a regular polygon, apothem is the distance from the center to a side

Polygon Radius
For a regular polygon, radius is the distance from the center to a vertex.