If the circumference of a circle increases from 4πto 8π,then find the percentage increase in the area of the circle.
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Step-by-step explanation:
1st case
c = 4π
= 2rπ
r = 2
AR = πr*2
AR = 4π
2nd case
c= 8π
r = 4
AR = πr*2
AR = 16π
percentage of increase
= 16π - 4π / 4π multiply 100
3 multiply 100
= 300%
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Answer:
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