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In this video we discover what they all mean. The radius is the distance from the centre of a...\u003c/span\u003e\n\u003cspan class='full-description hide'\u003eDESCRIPTION: There are some key words we need to know for circles: radius, circumference, diameter, sector, segment, tangent, chord and arc. In this video we discover what they all mean. The radius is the distance from the centre of a circle to a point on the circle. A diameter is the distance across a circle through its centre point. The circumference is the distance around the edge of a circle. A sector is the part of a circle enclosed by two radii of a circle and their intercepted arc. A pie-shaped part of a circle. A segment is the region between a chord of a circle and its associated arc. A tangent is a line that touches a circle at only one point. A chord is a line that links two points on a circle or curve (it doesn’t have to pass through the centre). An arc is a part of the circumference. 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