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2015-10-16T10:11:24+08:00

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Family of Concentric Circles (circles having same center point, but different radii).

The equation that satisfies the family of concentric circles:

x² + y² = r²      

Differentiate x² + y² =r²

2x + 2y  \frac{dy}{dx}= 0

x + y \frac{dy}{dx} =0

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