How do I find the surface area of a sphere with a diameter of 14 cm?

First, look up for equation to calculate the surface area of a sphere, I've done that for you and included it below:

##A = 4\pi r^2##

You already know the diameter is 14cm, so to find the radius ##r## you just divide the diameter by 2 to get ##r=7cm##

Next, substitute this into the formula you have above:

##A = 4\pi(7)^2## ##A = 4\pi(49)^2## ##A = 196picm^2##

Now, you can optionally convert this to a numerical value by substituting in an actual value of pi (3.14159...), but for precision it's usually best to leave the surface area in terms of a multiple of ##pi##.

The final numerical answer would be ##615.75cm^2##