Determine the radius — task. Mathematics CBSE, Class 10.

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Verify that

$(12, 9)$ is the centre of the circle passing through the point

$A(27, 21)$ ,

$B(21, -3)$ and

$C(-3,9)$ . Calculate the radius.

Answer variants:

$13$

$15$

$14$

$17$

The radius of the circle

.

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