Circles slide share

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Circles slide share

  1. 1. Circumference of a Circle Calculate the Circumference Using the Correct Formula 2-Oct-13 © Brain-Cells: E.Resources Ltd. All Rights Reserved 24/11/09 www.brain-cells.co.uk
  2. 2. C = Πd C = 3.14 X 12 C = 37.68 cm The circumference of a circle is its perimeter – the distance all the way around the edge. It is calculated using the formula: Diameter = 12 cm C = Πd The value Π can never be found exactly but for most problems the approximate value 3,14 is used. © Brain-Cells: E.Resources Ltd. All Rights Reserved 24/11/09 www.brain-cells.co.uk
  3. 3. Area of a Circle Calculate the Area Using the Correct Formula 2-Oct-13 © Brain-Cells: E.Resources Ltd. All Rights Reserved 24/11/09 www.brain-cells.co.uk
  4. 4. The Circle 1. Calculate the area of a circle RADIUS The distance from the centre to the edge DIAMETER The distance from one side to the other passing through the centre Π = 3.14 (approximately) D = 2 x R and R = D 2 © Brain-Cells: E.Resources Ltd. All Rights Reserved 24/11/09 www.brain-cells.co.uk
  5. 5. Radius = 6 A = πr2 A = 3.14 x r x r A = 3.14 x 6 x 6 A = 113.04 cm2 The area of a circle is calculated using the formula: © Brain-Cells: E.Resources Ltd. All Rights Reserved 24/11/09 www.brain-cells.co.uk

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