Polygons
A polygon is a flat figure. A flat figure means it is two-dimensional. Two dimensional does not mean it has two sides. It means it has length and width but no height.

A polygon is made up of straight lines and is enclosed. There must be a minimum of three straight lines that connect to each other.

Review: This will help you define a polygon.  Flat - this means it's a plane figure or two-dimensions. Straight lines - these are called segments in geometry.
Cubee "D"
There are two polygons on Cubee "D" s face. What are the names of the two polygons?