## Defining Pi Project, Part 3: Developing Generalizations (10 minutes)

• By now, you should have completed at least three constructions.
• Sit with your partner, and take out Part 3.
• It’s ok if you don’t know the “right” answers yet – put your best thinking on the page.
• You have 10 minutes to complete Part 3.

## Defining Pi Project, Part 4: The Big Chart (5 minutes)

• Step 1: Take 5 minutes to transfer your values from Part 2 to the table in Part 4.
• In 5 minutes, we will start another example.

## Example: 360 Slices (15 minutes)

• Can we fill out a row in our analysis chart for 360 slices without actually constructing a 360-gon?

## Continuing on The Big Chart (10 minutes)

• Try to fill in the missing values for our 360-gon.
• Think about how you could fill in two more rows of this chart.
• If you’re not done with Part 3, finish it now.  Does Part 4 help you with Part 3?
• Answer the questions on the back of the page.

## Using Excel as a Tool

• How can we use our discussion from the 360-gon example to help us create algebraic expressions that a computer can use to perform the calculations for us?

## Closing: Record Sheets

• Write a sentence or two about what you did today.
• What does it mean to be precise?