If the radius of a circle is increased by 10 % then corresponding increase in the area of the circle is .....(=3.14)
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Step-by-step explanation:
Area of circle =πr^2
Area of new circle
=π×(r+r/10)^2
=π×121r^2/100
Increase
=π121r^2/100-πr^2
=πr^2(21/100)
Increase %
=πr^2(21/100)/πr^2×100
=21%
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