Radius - Distance from center, Diameter - Twice the radius, Circumference - Perimeter of the circle, Chord - Line segment in circle, Arc - Part of circumference, Sector - Pie-shaped part of circle, Tangent - Line touching circle once, Central Angle - Angle at circle's center, Inscribed Angle - Angle on circle's edge, Segment - Region between chord and arc,

Circle Properties

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