To find the circumference of a circle, you need only know the radius or diameter of the circle.
The circumference of a circle is calculated as
2 x Pi x radius
OR
Pi x diameter.
Pi is approximately 3.1415926.
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You will have to measure some part of the circle. As long as you have absolutely no information about a circle, you can't do any calculations.
To find the area of a circle knowing only the circumference, you can use the formula A = (C^2) / (4π), where A is the area and C is the circumference. Square the circumference, then divide it by 4π to get the area.
If the table is circular, then its circumference is 18.845 (rounded) If it's not a circle, then the circumference can't be calculated knowing only the area.
If the circumference of a circle is 6.28 then its area is about 3.138 square units
Well, what you do is you would find the circumference, or the distance around the circle.