Not quite sure what you mean by "true way". You can measure it with a string or a similar flexible object. Or you can measure length and width, and - assuming it is an ellipse - use the formula for the circumference of an ellipse - or rather, an approximation formula.
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the way you find the circumference is 2xpixr or pixdiameter. so it would be 2x80xpi
You need to know the radius first. Next you simply double the radius to get the diameter and then multiply that by pie and you have now worked out the circumference of your circle :)
The circumference of a circle is its perimeter
The way this question is worded indicates that the circumference is 2 ft.
Circumference and the formula for circumference is C=πd or C=2rd