If error in measuring diameter of a circle is ( 4 % ) the error in circumference of the circle would be :
(1) ( 2 % )
(2) ( 8 % )
(3) ( 4 % )
(4) ( 1 % )

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( begin{aligned} pi d &=-mathbb{C} c &=pi d frac{Delta C}{c} &=frac{Delta d}{d} &=4  mathrm{} end{aligned} )

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