A square sheet is folded left onto right, top onto bottom, and then along the diagonal of the small square (lower-left half up). A small square is cut from the corner of the triangle on the right edge, as shown. Which figure shows the opened sheet?

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Accepted Answer

(a). That corner is the middle of the sheet's right edge. Undo the diagonal fold: a notch also appears at the middle of the bottom edge. The quarter folds then copy these to the left and top edges: a notch at the middle of every edge, (a).

A square sheet is folded left onto right, top onto bottom, and then along the diagonal of the small square (lower-left half up). A small square is cut from the corner of the triangle on the right edge, as shown. Which figure shows the opened sheet?

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