The equation of a circle with centre as the origin is

x² + y² = r²

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(x – a)² + (y – b)² = r² , where a and b are positive integers

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(x)² =ay

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(y)² =ax

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Solution

The correct option is A
x² + y² = r²

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Similar questions

r (< a)

\frac{x^{2}}{a^{2}} + \frac{y^{2}}{b^{2}} = 1, (a > b)

x^{2} + y^{2} = r^{2}

x^{2} + y^{2} - 2 a x = 0

x^{2} + y^{2} = r^{2}

α

x^{2} + y^{2} = r^{2}

x^{2} + 2 x y tan 2 α - y^{2} = a^{2}

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