The formula for the Surface area of a sphere is 4 times pi radius squared.

For this activity, we started by cutting the orange in half and drawing as many circles from it’s hemisphere. After taking out the inside flesh of the orange, we pealed them into flat laying pieces. We filled in all the white spaces of each circle with the orange peals so there was no white spaces left, and the whole circle was covered. We discovered that there were four circles that it took up, so we concluded that its surface area is 4 * Pi * r^2 (Four times Pi radius squared.)