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5c3. Circles
A circle is the set of all points in a plane that is the same distance(called the radius) from a given point called the center. A circle has infinite sides. A circle measures 360 degrees.
Some basic definitions of a circle
  • A line segment within a circle that touches 2 points on the circle is called a chord.

  • A line within a circle that touches 2 points on the circle is called a Secant.

  • The longest distance from one end of a circle to the other is called the diameter. Diameter is the longest chord of the circle. The diameter of the circle is twice the radius.

  • The distance or the perimeter around the circle is called circumference. Circumference = 2 π r or π d. (π = 3.14)

  • The area of the circle enclosed between any two radii and either of the arcs that are cut off is called the sector of the circle.

  • Area of the circle lying between a chord and the corresponding arc cut off by the chord is called a segment.

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