A disc has a diameter of 21 centimetres. What is the distance around the disc?
(Take ∏ = 3.14)
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The formula for circumference C of a circle is
C = ∏ x d
Where:
∏ = 3.14 (pi)
d = diameter of the disc
Given d = 21 cm
Now substitute d into the formula
C = 3.14 x 21
= 65.94 cm
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