Question

What will be the formula of diameter from the equation of a circle?

Answer

$\mathrm{The\; equation\; of\; the\; circle,\; the\; coordinates\; of\; the\; extremities\; whose\; diameter\; are}\left(x_1,y_1\right)\mathrm{ and }\left(x_2,y_2\right)\mathrm{ is\; given\; by:}$
$\left(x–x_1\right)\left(x–x_2\right)+\left(y–y_1\right)\left(y–y_2\right)=0$

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