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The bottom-left corner of a square sheet is folded in to meet the centre (the darker triangle). A diamond is punched through the flap and a round hole in a single layer. Which figure shows the sheet opened?

Competition practicePaper Folding & Punching
  • A(c)
  • B(a)
  • C(b)
  • D(d)

Step-by-Step Solution

The flap opens back to the bottom-left corner, so the diamond gets a twin mirrored across the slanting crease, near that corner. The round hole has no twin: (c).
Answer: A) (c)

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