How do you find the surface area of a sphere

The video tutorial explains how to calculate the surface area of a sphere using the formula 4πR². It begins by introducing the concept and formula, then explains the relationship between diameter and radius. The tutorial proceeds with a step-by-step calculation using a given radius, and concludes with finalizing the calculation and clarifying the units used.

What is the numerical value of π used in the calculation?

What are the units for the surface area calculated in this example?