parts of a circle

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Last updated 10:46 PM on 5/8/25
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14 Terms

1
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circle

the set of points equal distance from the given point (the center)

2
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radius

  • a segment with an end point at the center

  • on the circle

3
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Radii

plural for radius

4
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chord

a segment with endpoints on the circle

5
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diameter

a chord that passes through the center

6
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secant

a line that intersects the circle in two places

7
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tangent

a line that intersects the circle at exactly one place

8
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point of tangency

the point at which the tangent line intersects the circle

9
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central angle

an angle with a vertex at the center and sides that use radii

10
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inscribed angle

  • an angle with a vertex on the circle

  • two sides that are chords

11
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arc

a portion of the edge of the circle defined by two endpoints

12
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minor arc

  • an arc with a measure less than 180°

  • two letters to measure it

13
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major arc

  • an arc with a measure greater than 180°

  • three letters to measure it

14
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semicircle

an arc with the end point on the diameter