Understanding the Surface Area of a Sphere Formula

I made this with a lot of heart, and every purchase helps me keep creating. If you like what I do or just want to support independent makers, check it out: http://amazon.com/gp/product/B093D22DGN Thank you for being here—it really means a lot. Deriving the formula. Proof and explanation that Surface Area of a Sphere is equal to 4πr^2 using geometry and algebra. The surface area of a sphere is the area occupied by the surface of the sphere.