![]() Reflection in the line AOB reflects the circle onto itself. If AOB is a diameter of a circle with centre O, then the.A circle has every possible rotation symmetry about its centre, in that every rotation of the circle about its.Thus a chord is the interval that the circle cuts off a secant, and a diameter is the interval cut off by a secant passing through the centre of a circle centre. A line that cuts a circle at two distinct points is called a secant.The word ‘diameter’ is use to refer both to these intervals and to their common length. ![]() Since a diameter consists of two radii joined at their endpoints, every diameter has length equal to twice the radius.
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