1.

Cicumfernce (c) of a circle is directly propotional to its radius (r).

Answer»

That is, the circumference of a circle is proportional to its radius, R; double R and you double C. The FACTOR '2 PI' is simply the constant of proportionality between C and R. So the AREA of a circle is proportional to R2 and pi is the constant of proportionality between the area and the radius of a circle.



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