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CIRCLES AND CYLINDERS

 YEAR 8 MATHEMATICS
Circumference of a Circle
Radius or Radii (plural)   Sector    Diameter




    Circumference            Arc       Chord




       Quadrant            Segment   Semi circle
Therefore the formula to remember for the
circumference of a circle is:



c = πd             OR
                          c = 2πr
Circumference of a Circle
C=ΠD

Where D = 24cm and Π=3.14

Therefore

C = 24 x 3.14
C ≈ 75.39cm
C=2Πr

Where r = 5cm and Π=3.14

Therefore

C = 2 x 3.14 x 5
C ≈ 31.41 cm
Remember that the circumference of the circle calculates the
distance on the arc (around the outside) so if you are to find the
perimeter of the semi circle we need to include the diameter.


                  (π ×12)
               P=         +12
                     2

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Circumference of a Circle

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