What is a Circle (Circle Parts and Terms)

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00:00 A CIRCLE is a shape formed by all points in a plane that are at a given distance from the center
00:09 An ARC is any connected part of a circle
00:13 Specifying two end points of an arc and a center allows for two arcs that together make up a full circle
00:24 CIRCUMFERENCE is the length of one circuit along the circle or the distance around the circle
00:31 The distance between any point of the circle and the centre is called the RADIUS
00:42 DIAMETER is the line segment whose endpoints lie on the circle and that passes through the centre
00:49 or the length of such a line segment
00:53 This is the largest distance between any two points on the circle
00:59 its length is twice the length of a radius
01:03 It is a special case of a CHORD, namely the longest chord for a given circle
01:11 CHORD is a line segment whose endpoints lie on the circle
01:17 thus dividing a circle into two segments
01:26 SEGMENT is a region bounded by a chord and one of the arcs connecting the chord's endpoints
01:34 Sometimes the term segment is used only for regions not containing the center of the circle to which their arc belongs to
01:50 SECTOR is a region bounded by two radii and an arc
01:55 where the smaller area is known as the MINOR SECTOR and the larger being the MAJOR SECTOR
02:05 SECANT is an extended chord, a coplanar straight line, intersecting a circle in two points
02:14 TANGENT is a coplanar straight line that has one single point in common with a circle
02:21 it touches the circle at this point
02:28 PASSANT is a coplanar straight line that has no point in common with the circle

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