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A square sheet is folded along the diagonal from top-left to bottom-right, the lower-left half going up. A small triangle is cut from the middle of the slanting folded edge. Which figure shows the opened sheet?

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

Step-by-Step Solution

The cut touches the slanting crease, so it joins with its mirror image across the diagonal. The two triangles make a small square hole sitting on the diagonal at the centre: (a).
Answer: B) (a)

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