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Folding a square sheet along the diagonal from top-left to bottom-right, Kabir brings the upper-right half down. He punches a triangle pointing up and a round hole. Which figure shows the sheet unfolded?

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

Step-by-Step Solution

A mirror across this diagonal turns 'up' into 'left', so the triangle's twin points left; it sits where the distances from the left and top edges are swapped: (a).
Answer: D) (a)

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