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Parts of a Circle

C. Parts of a Circle. Circle – set of all points _________ from a given point called the _____ of the circle. equidistant. C. center. Symbol:. CHORD:. A segment whose endpoints are on the circle. DIAMETER:. Diameter. Distance across the circle through its center. P.

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Parts of a Circle

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  1. C Parts of a Circle Circle – set of all points _________ from a given point called the _____ of the circle. equidistant C center Symbol:

  2. CHORD: A segment whose endpoints are on the circle

  3. DIAMETER: Diameter Distance across the circle through its center P Also known as the longest chord.

  4. Radius RADIUS: Distance from the center to point on circle P

  5. D = 24 12 r = 4.5 9

  6. Q R P S T Use P to determine whether each statement is true or false.

  7. Secant Line: intersects the circle at exactly TWO points SECANT sounds like second

  8. Tangent Line: a LINE that intersects the circle exactly ONE time Point of Tangency – where the tangent line intersects the circle. Forms a 90°angle

  9. Name the term that best describes the line/segment. Secant Radius Diameter Chord Tangent

  10. THINGS TO KNOW AND REMEMBER ALWAYS A circle has 360 degrees A semicircle has 180 degrees Vertical Angles are Equal Linear Pairs are Supplementary

  11. Central Angle : vertex is at the center of the circle A P C B APB is a Central Angle

  12. Case I:Vertex is AT the center A P C B

  13. Central Angle : vertex is at the center of the circle ACB AB A Minor Arc Major Arc Less than 180° More than 180° P C B Need 2 letters to name it. Need 3 letters to name it.

  14. EDF Semicircle: An Arc that equals 180° To name: use 3 letters D E P Touches a diameter. F

  15. measure of an arc = measure of central angle m AB m ACB m AE A EB is a diameter. E 96 Q = 96° B C = 264° = 2x + 14 Find x. x = 35

  16. p. 193 #1 – 18

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