User talk:Thomaskader

The earth is a sphere. How do we calculate the Surface area of a sphere? Go to Wolfram Alpha.com and input Sphere, https://www.wolframalpha.com/input/?i=Sphere, you will observe S = 4 pi a^2

I am asking, 4 of Pi. Why are we multiplying Pi? What does the inference have to do with the variable a? Why do we square A?

Thomas Kader 13:42, 6 May 2017 (UTC)