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Tangents, Arcs and chords, basic terms Section 9-1
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Circle Circle- The set of points in a plane at a given distance from a given point in that plane.
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Center Center- The given point (C) in the middle of a circle. C
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Radius Radius- The given distance between the center and circumference of a circle. C
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Chord Chord- A segment whose endpoints lie on a circle. C
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Secant Secant- A line that contains a chord. C
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Diameter Diameter- A chord that contains the center of a circle. C
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Tangent Tangent- A line in the plane of a circle that intersects the circle in exactly one point. C T
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Point of Tangency Point of Tangency- The point (T)where a tangent intersects a circle. C T
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Sphere Sphere- A sphere with center O and radius R is the set of all points in space at a distance R from point O
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Congruent Circles (or spheres)- Congruent Circles (or spheres)- Circles (or spheres) that have congruent radii. C 3 D 3
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Concentric Circles Concentric Circles- Circles that lie in the same plane and have the same center. C
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Concentric Spheres Concentric Spheres- Spheres that have the same center.
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Inscribed/Circumscribed Inscribed- A polygon is inscribed in a circle when each vertex of the polygon lies on the circle. Circumscribed- A circle is circumscribed about the polygon when each vertex of the polygon lies on the circle.
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Inscribed/Circumscribed
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