Question

what is the formula for the surface area of a sphere?
a = 2πr
a = 4πr²
a = 4πr³
a = πr²

Explanation:

The surface - area formula for a sphere with radius \(r\) is a well - known geometric formula. It is derived from integral calculus and represents the total area covering the outer surface of the sphere. The correct formula is \(A = 4\pi r^{2}\).

Answer:

B. \(A = 4\pi r^{2}\)