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Along the diagonal from its top-left to its bottom-right corner, a square sheet is folded with the lower-left half going up. A triangle pointing up and a round hole are punched. Which figure shows the sheet when opened?

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

Step-by-Step Solution

A mirror across this diagonal swaps 'across' and 'down', so a triangle pointing up becomes one pointing left, and the twin of a hole near the top edge lies near the left edge: (d).
Answer: C) (d)

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