What is the formula for the surface area of a sphere with radius r?

The answer is C. 4r^2.

Step-by-step explanation:

The surface area of a sphere is the same as the lateral surface area of a cylinder having the same radius as the sphere and a height the length of the diameter of the sphere.

The lateral surface area of the cylinder is 2rh where h=2r .

Lateral Surface Area of the Cylinder =2r(2r)=4r^2 .

Therefore, the Surface Area of a Sphere with radius r equals 4r^2 .

0.84 dang lotta people are looking for this lol or if you round up its 1 but the overall answer to that is 0.84

step-by-step explanation:

here is your mark brainliest