the centre of a circle is (2a,a-7) using distance formula find the values of 'a' if the circle passes through the point (11,-9),and has the diameter 10 root 2 units
length of the diameter =
therefore the radius r =
let the center of the circle be C .
let it passes through the point P(11,-9).
therefore PC= r
therefore a=3 or a=5.
hence the center of the circle is
i.e. the center of the circle is (6,-4) or (10,-2).