First, look up for equation to calculate the surface area of a sphere, I’ve done that for you and included it below:
##A = 4pi 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 = 4pi(7)^2##
##A = 4pi(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##
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