Circumference of a circle is 2*pi*radius or pi*diameter. Therefor, if the circumference of the table is 15.7 cm then its diameter is 15.7/pi = 4.9975 cm or roughly 5 cm. So the circumferences and diameters of the table and its leg are equal.
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Circumference = 72*pi
A table which is 90 inch around its outside (circumference) is 28.648 inches (to 3 dp) across (diameter).
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.
about 28 ft.
circumference = 2 times pi times r OR pi times d diameter = 60 inches pi = 2.1415927 circumference = 2.1415927 x 60 = 128.4956 inches (approximately 128 1/2 inches)