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A square sheet is folded along its diagonal so that the lower-left half lies over the upper-right half. A triangle is cut away from the folded edge. Which figure shows the opened sheet?

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

Step-by-Step Solution

The cut touches the diagonal fold, so the triangle and its mirror image across the diagonal join into one square hole on the diagonal: (d).
Answer: B) (d)

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