Assuming you mean a circle.
Then use the equation.
C = pi*d
'pi' is the constant of direct proportion of circles, and has the approximate value os 3.1416
Hence
C = 3.1416 x 7ft = 21.9912 ft.
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The circumference will be 7*pi feet
Circumference of the circle = 7*pi feet
There is a problem here. A circle with a 7-foot diameter has a circumference of 21.99 feet, not 10 feet.If the circumference is 10 feet, that would make the diameter 3.183 feet.
If its circumference is 21.98 feet then its diameter is 21.98/pi = 7 feet rounded up.
If the circumference of a circle is 20 feet the diameter is: 6.366 feet (circumference divided by pi = diameter).