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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
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
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
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
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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Circles slide share

  • 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. 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. 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. 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. 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