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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.