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Sagot :
The circunference of a circle is given by:
[tex]C=2\pi r=\pi d[/tex]where r is the radius of the circle and d is the diameter (d = 2r).
So, we can see that the circunference of a circle is equal to its diameter times a constant number (even though pi has an infinte number of decimals, it is a constant number)
* Note:
I'm guessing here, but given the question, I think that what you may do is drawing some circles with different diameters, then mesure their circumferences, an see that the following holds:
[tex]\frac{C_1}{d_1}\text{ = }\frac{C2_{}}{d_2}\text{ =}\frac{C_3}{d_3}\text{ = }\ldots.\text{ for as many circles as you draw}[/tex]Where C_1 is the first circle circumference and d_1 is its diameter, and so on and so furth.
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