The area ratio of the sampler is __________ Options: A . &nbsp\(\frac{D_2^2-D_1^2}{D_1^2}×100\) B . &nbsp\(\frac{D_1^2-D_2^2}{D_1^2}×100\) C . &nbsp\(\frac{D_2^3+D_1^3}{D_1^2}×100\) D . &nbsp\(\frac{D_2^2-D_1^2}{2D_1^2}×100\)

Answer: Option A Answer: (a). \(\frac{D_2^2-D_1^2}{D_1^2}×100\)

The area ratio of the sampler is _________

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