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For a horizontal strip, the elementary area would be:
Ay dx
Bx dx
Cy dy
Dx dy
Answer & Solution
Correct answer: D. x dy
1. A horizontal strip has width x and thickness dy.
2. Its area is again length times thickness.
3. That gives x dy.
4. So the answer is x dy.
_Source: NCERT Class 12 Mathematics, Ch 8 'Application of Integrals'_
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