A square sheet is folded along one diagonal (lower-left half up) and then along the other, leaving a small triangle. A tiny triangle is cut from the corner of the folded piece at the centre of the sheet. Which figure shows the opened sheet?

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Accepted Answer

(c). Undo the second diagonal fold: the cut is mirrored to the other side of that crease. Undo the first: both are mirrored across the other diagonal. The four small triangles touch at the centre and make two small squares meeting corner to corner: (c).

A square sheet is folded along one diagonal (lower-left half up) and then along the other, leaving a small triangle. A tiny triangle is cut from the corner of the folded piece at the centre of the sheet. Which figure shows the opened sheet?

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