Table of Contents

1. basic Circumference problems
   1. Arcs and Radii
   2. Perimeter & Circumference 1
   3. Perimeter & Circumference 2
2. learning about Pi
   1. TRUE MEANING of π
   2. 劉徽的「割圓術」
   3. 於圓周率日一起學習是緣份、恩典
3. Circles within a Circle
   1. Circles within Circle 1
   2. Semicircles within Semicircle
   3. Four Semi-circles
   4. Squares within Square v.3
   5. 2.大中小圓問題
4. 'Rugby' shape problems
   1. 圓形重疊問題
   2. 'Rugby' shape & its Perimeter
   3. 'Rugby' shape & its Perimeter
   4. 'Rugby' shape & its Perimeter
5. more for Explorations
   1. Three Touching Circles
   2. 3 touching circles