The question is asking for the amount of glass needed, meaning we must find the area of the circular tabletop, and that will give us how much glass he needs.
Area of a circle formula:
A=π•r²
Input the known values into the formula. We know the radius is 22in.
A=π•(22)²
A=π•484
A≈1,520in²
So, your answer is option C.