Answers

2014-03-08T10:06:01+08:00
Circle is the set of all points that are at a fixed distance  from a fixed point in the plane.
Formula:
(x-a)^2 + (y-b^)2 = r^2

Area:
A= \pi r ^{2}



2 1 2
circle is the circle and its formula is pier2
2014-03-08T10:50:24+08:00
Circumference = 2x3.14xradius
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