A square sheet is folded along a diagonal so the lower-left half lies over the upper-right half; then the left corner of that triangle is folded over along an upright crease (the darker flap). A square and a round hole are punched. Which figure shows the opened sheet?

Question

Accepted Answer

(a). Undo the upright fold: the square hole on the flap gets a twin to its left. Undo the diagonal fold: every hole gets a twin mirrored across the diagonal. The round hole was under no flap, so it makes only two holes: (a).

A square sheet is folded along a diagonal so the lower-left half lies over the upper-right half; then the left corner of that triangle is folded over along an upright crease (the darker flap). A square and a round hole are punched. Which figure shows the opened sheet?

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