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18 February, 10:50

Radius of a circle is increased by 50 %. find the % increase in circumference of the circle?

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  1. 18 February, 13:14
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    The circumference is merely increased by 50%. The formula for a circle (which I assume you know) is 2*pi*r. Work out this value, then multiply it by 1.5. You get the same answer as multiplying 2*pi * (r*1.5). Just fyi (if you didn't know), multiplying something by 1.5 increases it by 50%, multiplying something by 1.12 increases something by 12% etc.
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