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CENTRE: A point inside the circle. All points on the circle are equidistant (same distance) from the center point.
RADIUS: The radius is the distance from the center to any point on the circle. It is half the diameter.
DIAMETER The distance across the circle. The length of any chord passing through the center. It is twice the radius.
CIRCUMFERENCE: The circumference is the distance around the circle.
AREA: Area of the region enclosed by the circle.
CHORD: A line segment linking any two points on a circle.
TANGENT: A line passing a circle and touching it at just one point.
SECANT: A line that intersects a circle at two points.