alleryFor a vertical strip of height y and width dx, dA equals:
Ay dy
Bx dx
Cy dx
Dx dy
Answer & Solution
Correct answer: C. y dx
1. A strip is treated as a thin rectangle.
2. Its area is height times width.
3. That gives dA equal to y dx.
4. So the answer is y dx.
_Source: syllabus Mathematics, Ch 8 'Application of Integrals'_
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