There are probably several ways to approach it; one general equation for the circle is:
(x - a)2 + (y - b)2 = r2
This describes a circle with center at coordinates (a, b), and with a radius of r.
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General form for a line equation is: y=mx+b.
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It depends on the form of the equation.
The general equation is y = mx + c. m is the slope of the straight line. c is the y intercept. This is readily obtained by putting x = 0 then the general equation simplifies to y = c.
It is NOT a formula but an EQUATION . The answer is C = pi*d This equation has been known for thousands of years. It can also be in the form of C = 2 pi r NB 2r = d Also A = pi r^(2) for the area of a circle.