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1. point A(0,2) and B(4,8)
Calculate the coordinates of the centre of the circle which passes through A,B and the origin.

I know this will involve simultaneous equations but how do I get 2 equations from the data given?
2. Useful Fact #3: The perpendicular bisector of a circle's chord passes through the center of the circle.

May be overcomplicating it though.
3. (Original post by aznkid66)
Useful Fact #3: The perpendicular bisector of a circle's chord passes through the center of the circle.

May be overcomplicating it though.
but of C2 coming in now
point A(0,2) and B(4,8)
Calculate the coordinates of the centre of the circle which passes through A,B and the origin.

I know this will involve simultaneous equations but how do I get 2 equations from the data given?
You get 3 equations.
(x - a)2 + (y - b)2 = r2
Sub in the points given to this equation as x and y and you'll have three equations.
(a,b) is the centre of your circle.
It comes out rather neatly

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