What is the equation for the surface area of a sphere?

What a cool question! Are you planning on wallpapering a giant basketball? Well, the formula is $S A = 4 \pi {r}^{2}$ just in case you want to calculate it!
You could even use that formula to calculate how much the surface area of the moon is! Make sure to follow the order of operations as you go: first, square your radius, then multiply it by $4 \pi$ using a calculator with a stored approximate value for $\pi$. Round appropriately, and then label your answer in square units, depending on what unit of length you are using for the radius. (ex: radius is measured in miles, surface area will be square miles)