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Tangents, Arcs and chords, basic terms Section 9-1.

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Presentation on theme: "Tangents, Arcs and chords, basic terms Section 9-1."— Presentation transcript:

1 Tangents, Arcs and chords, basic terms Section 9-1

2 Circle Circle- The set of points in a plane at a given distance from a given point in that plane.

3 Center Center- The given point (C) in the middle of a circle. C

4 Radius Radius- The given distance between the center and circumference of a circle. C

5 Chord Chord- A segment whose endpoints lie on a circle. C

6 Secant Secant- A line that contains a chord. C

7 Diameter Diameter- A chord that contains the center of a circle. C

8 Tangent Tangent- A line in the plane of a circle that intersects the circle in exactly one point. C T

9 Point of Tangency Point of Tangency- The point (T)where a tangent intersects a circle. C T

10 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

11 Congruent Circles (or spheres)- Congruent Circles (or spheres)- Circles (or spheres) that have congruent radii. C 3 D 3

12 Concentric Circles Concentric Circles- Circles that lie in the same plane and have the same center. C

13 Concentric Spheres Concentric Spheres- Spheres that have the same center.

14 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.

15 Inscribed/Circumscribed


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