On the whole all this requires is a large compass, which can be made anchoring a stiff piece of wood or ruler at the centre of the square tablecloth (using a pin or similar pointed object). Make sure that it can rotate without losing the centre point. Attach a piece of tailor's chalk to the other and rotate to make a perfect circle. Cut the circle out with sharp scissors that avoid fraying. Leave at least an inch extra around the outside for creating a hem.
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One can buy a 90 inch round tablecloth online when one goes to the website of Linen Tablecloth. Price starts at $10. The most expensive one is only $20.
Basically, you don't. You can't convert square feet to feet.
The basic difference between oblong and oval is the shape at the short end. i.e. An oval is rounded at the short end and straight in the middle. To draw them it can be represented as [] =oblong (rectangular) & 0 =oval A true oval tapers to the ends, while an oblong shape has parallel sides (an oblong is an extended square or circle). So if your intent is to put a tablecloth on a round table after adding leaves, an oblong tablecloth would be best. An oval tablecloth of the right length might not be wide enough at some points, and the problem gets worse as you add more leaves. That said, the tablecloth sellers I looked at online all make their "oblong" tablecloths as rectangles, not elongated circles. If you want an elongated circle, to provide even overhangs on a circle with leaves, use a custom tablecloth site. Here is a table linens size chart that may be of some help. http://www.TableclothsForLess.com/tablecloth-sizes.html
"Square peg in a round hole" means something that doesn't fit in where it is; the opposite is something that is exactly where it should be. An example of this might be "hand in a glove".
To find the correct size table linens you have to start with shape: square, oval, oblong, or round. Then you must measure the table and account for drop on the sides. Using this formula should give you an estimated size: Length of table + (desired dropx2)=tablecloth length. Width of table + (desired drop x2 ) = tablecloth width.