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Like a pair of doors, the left and right quarters of a square sheet are folded in to meet at the centre line. A right-pointing triangle is punched through the left door and a left-pointing triangle through the right door. Which figure shows the sheet opened?

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

Step-by-Step Solution

Each door opens back to its own side. The left door's triangle gets a twin near the left edge, now pointing left; the right door's triangle gets a twin near the right edge, now pointing right: (d).
Answer: C) (d)

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