Question

The surface area S of a sphere of radius r is 4π times the square of the radius. Write a formula for S as a function of r. S= ________

Answer 1

S = 4π·r²

Step-by-step explanation

As explained in the question, the surface area is 4π times the square of the radius. So the formula for S as a function of r is r squared, multiplied by 4π,

`S=4\pi\cdot r^2`