How many square feet are in a round table with a 60" diameter table top?

I am trying to calculate the weight of a round granite slab table top, so that I can buy a table base that can hold it. I know that the 3cm thick granite slab weighs 18 lbs./sq. ft. but I'm not sure how to calculate how many square feet are in a 60" diameter round table top. thanks in advance for your help!

3.14 X 2.5 x 2.5 = 19.625 sq. ft.

raduis x radius x 3.14 = sq. ft. of a circle.

2.5 x 2.5 x 3.14 = 19.625 sq. ft.

19.68 this is 2.5 squared times Pi, 3.1415

How many square feet are in a round table with a 60" diameter table top?

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