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investigate the relationship between the diameter and circumference of a circle.

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circumference – the perimeter of a circle diameter – the distance across a circle through the center radius – half the diameter Circumference & Diameter

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Symbol for pi π π = circumference ÷ diameter = 3.14 Formula for finding the circumference of a circle is: C = π x d Want some pi?

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Calculate the circumference of a circle with a diameter of 8.15 cm. C = π x d C = 3.14 x 8.15 C = 25.59 cm Example

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Calculate the circumference of a circle with a diameter of 6.5 cm. C= 20.41 Calculate the circumference of a circle with a diameter of 62.5654 cm. 196.46 Your Turn

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What do you do if you know the circumference and are trying to find the diameter? Use the following formula: d = c ÷ π Other Way

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Page – 211 – 213 # 1, 2, 3, 4, 5, 8, 9, 12, 13, 15 Work on

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