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Solution 4.1:5a

From Förberedande kurs i matematik 1

Revision as of 11:09, 27 September 2008 by Ian (Talk | contribs)
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A circle is defined as all the points which have a fixed distance to the circle's midpoint. Hence, a point xy  lies on our circle if and only if its distance to the point 13  is exactly 2. Using the distance formula, we can express this condition as


x−12+y−22=2 


After squaring, we obtain the equation of the circle in standard form:


x−12+y−22=4 

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