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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: syllabus Mathematics, Ch 8 'Application of Integrals'_
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