This mini-lesson has been designed to fit into a composition size interactive notebook , but can also be left unfolded for a binder.
This is a great one day lesson. The outside has an explanation and formula, the inside has four problems with graphs included for visual representation.
There is a problem that requires knowledge of a centroid as having a 2:1 ratio, great example of partitioning in action.
The answer key includes work on the graph as well as the formula worked out.