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Cut a circle in two exact halfs and you'll know :)
It's a Pie graph or Pie Chart are two other common names for a circle graph.
chords and secants are same as secant mean - a line which passes the circle by cutting it at two distinct points chord mean - it is a straight line segment whose endpoint both lie on the circle
I assume you mean radius of a circle, which is just half the diameter. So you measure the distance across the circle at the widest point, and then divide by two
A circle is two dimensional.