If the point P(2, 4) lies on a circle, whose centre is C(5, 8), then the radius of the circle is
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distance between (2,4) and (5,8) = radius
=√ (5-2)²+(8-4)²
= √9+16
5
=√ (5-2)²+(8-4)²
= √9+16
5
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