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02-07-2020
Mathematics

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The circumference of a circle is 19.8mm. Find the length of the radius. Give your answer rounded to 1 DP.

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02-07-2020

Circumference of a circle = 2pie*r
= 19.8=2*314*r/100
= 1980 = 628*r
r = 1980/628
r = 3.13
~= 3 cm^2
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