Chapter 25 Circle Properties. Circles Circumference = Distance whole way round Arc = Distance round part of circle Radius = Line from centre to edge Diameter.

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Presentation transcript:

Chapter 25 Circle Properties

Circles Circumference = Distance whole way round Arc = Distance round part of circle Radius = Line from centre to edge Diameter = Line from edge to edge through the centre

Chord = Line from edge to edge not through the centre Tangent = Line outside circle that touches it once Sector = Slice of circle Segment = Part of Circle

Angles in Circle Angle in a semi-circle = 90 o Angle at centre = twice angle at edge (if starting & finishing at same place) Angles at edge are equal (if starting & finishing at same place) Opposite angles in a cyclic quadrilateral add to 180 o

Tangents The angle between the radius and the tangent is always 90 o