Problem 20 · 2012 Math Kangaroo
Stretch
Spatial & Visual Reasoning
paper-cuttingfoldingreflection
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Answer: C
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Hint 1 of 2
Each fold is a mirror line, so the single cut becomes several cuts when unfolded.
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Hint 2 of 2
Reflect the cut corner back across each fold to see where all the holes land.
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Approach: unfold by reflecting the cut across each fold line
- Folding three times stacks the octagon into a triangle, with three mirror lines.
- The one corner you cut, reflected back across those folds, produces a symmetric ring of cuts.
- Unfolding shows the octagon with the matching missing region of picture C.
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