If radius of circle increase 1% then what is increment in area

1.	If radius of circle increase 1% then what is increment in area
Answer» Let the radius of the circle is \'r\' then area isπr²And 1%of radius \'r\' is r×1%=r÷100The area of new circle is π(r+r/100)²π(101r/100)²π×10201r²/10000Increment in area is πr²-πr²10201/10000πr²(1-10201/10000)πr²(10000-10201/10000)πr² (201/10000)The increment is201/10000

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