Conclude by giving your students these challenges:
- Phew I'm Factored by NRICH
- You Can't Make an Omelette... by NRICH
- 2002 AMC 8, Problem 1
Mentally determine what fraction is shaded.

Answer: \((1/4)\pi - 1/4\)
Conclude by giving your students these challenges:
Mentally determine what fraction is shaded.
Answer: \((1/4)\pi - 1/4\)