Circumference of a Circle

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Circumference of a Circle

  1. 1. CIRCLES AND CYLINDERS YEAR 8 MATHEMATICS
  2. 2. Radius or Radii (plural) Sector Diameter Circumference Arc Chord Quadrant Segment Semi circle
  3. 3. Therefore the formula to remember for thecircumference of a circle is:c = πd OR c = 2πr
  4. 4. C=ΠDWhere D = 24cm and Π=3.14ThereforeC = 24 x 3.14C ≈ 75.39cm
  5. 5. C=2ΠrWhere r = 5cm and Π=3.14ThereforeC = 2 x 3.14 x 5C ≈ 31.41 cm
  6. 6. Remember that the circumference of the circle calculates thedistance on the arc (around the outside) so if you are to find theperimeter of the semi circle we need to include the diameter. (π ×12) P= +12 2

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