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Added parametric equation for a circle
:<math>(x-a)^2 + (y-b)^2 = r^2</math>,
:<math>(x-a)^2 + (y-b)^2 = r^2</math>,
where <math>(a,b)</math> is the center of the circle.
where <math>(a,b)</math> is the center of the circle.
It can also be described parametrically in terms of a parameter <math>t</math> as:
:<math>x = a + r \cos{t}</math>
:<math>y = b + r \sin{t}</math>
The distance around the circle, or [[circumference]], is given by:
The distance around the circle, or [[circumference]], is given by:
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