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15 April 2009

Circle Equation

All of you already know what circle is. But in mathematics, we define that a circle is the locus of all points equidistant to a point. Then the point is called, the central. And the distance is called radius. Mathematically, the equation of circle is very easy.

Equation of circle with central in the origin O(0,0) , and radius r.

Let T(x,y) in the circle. So, we have



Squaring both sides, we get



By this way, we get an equation of circle with central point in origin and radius r.

Equation of circle with central in the origin P(a,b) , and radius r.

Let T(x,y) in the circle. So, we have



by squaring both sides again, we get



So the equation of circle with the central point in P(a,b) and radius r is





Example.
Find the equation of circle which has radius 5 and the central point
a. in the origin
b. P(2,3)

Solution
a. By the equation above, we simply get



or

b. Analogue to the above, we get


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