Alarge dining room table is in the shape of a semicircle of
diameter12 feet, as shown above. of the following, which is
closest to the area of the table? (use π = 3.14.)

If you see 3.14 on the sheet, then that's the number you're supposed to use for pi .

The area of any circle is (pi) x (radius squared).
If the table were a full circle, its area would be (pi) x (6 squared) = 36 pi square feet.

But it's only half of that . . . 18 pi = (18) x (3.14) = 56.52 square feet.

That's called the "area" of the table, not the "square feet" of the table.

And another thing:   I see you're asking for the "closest" number.   Don't ask me 
how I know this, but I'm pretty sure that right under this question wherever you 
copied it from, there's a list of choices, and when you posted the question, for 
some reason you decided not to share the list.