Given a triangle [math]\bigtriangleup ABC [/math]. Construct the circle passing through the vertices of the triangle. [br][br] Such circle is called the [b][color=#0000ff]circumcircle[/color][/b] of [math]\bigtriangleup ABC [/math].[br][br][b]Note[/b]: Perpendicular bisector of any chord on a circle passes through the centre of such circle.