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Along the diagonal from top-right to bottom-left, the lower-right half of a paper square is folded up over the upper-left half. A triangle pointing right and a round hole are punched. Which figure shows it opened?

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

Step-by-Step Solution

A reflection in this diagonal turns 'right' into 'up' and places each twin where its distances from the bottom and right edges are swapped, in the lower-right half: (d).
Answer: A) (d)

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