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Vertical or horizontal strip?

Exercise and reference answers

Left
Vertical
Items
  1. Item
    Area is y dx
    Answer
    Vertical
  2. Item
    Width is dx
    Answer
    Vertical
  3. Item
    Indexed by x
    Answer
    Vertical
  4. Item
    Area is x dy
    Answer
    Horizontal
  5. Item
    Thickness is dy
    Answer
    Horizontal
  6. Item
    Indexed by y
    Answer
    Horizontal
Right
Horizontal
Instructions
Swipe left for vertical, right for horizontal.

Explanation

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