Oranges, String, Knife, Paper, Pencil (or pen), ruler, calculator, and class list.
1. Estimate the surface area of your orange and explain your reasoning.
2. With your string measure around you¡¯re orange and record your data.
3. Using a knife ¨C cut your orange in half.
4. Place half of your orange upside down on the paper, and trace the orange 6 times ¨C without overlapping.
5. In the first circle measure the diameter.
6. On your chart next to your name write in the circumference, the diameter, and calculate the last column ¨C Circumference ¡Â Diameter.
7. Combine the class data.
8. Now peel you orange and fit the peelings into the circles. ** Don¡¯t lose any**
9. Record your findings.
10. Discuss results.
C = 2¦Ðr
S.A. = 4¦Ðr2