Bending a square sheet along the diagonal from top-left to bottom-right, Uma brings the upper-right half down; then she folds the top part of the triangle down along a flat crease (the darker flap). A square and a round hole are punched. Which figure shows the opened sheet?

Question

Accepted Answer

(c). Undo the flat fold: the square on the flap gets a twin above the crease. Undo the diagonal fold: every hole gets a twin across the diagonal. The round hole was not under the flap, so it makes two holes; the square makes four: (c).

Bending a square sheet along the diagonal from top-left to bottom-right, Uma brings the upper-right half down; then she folds the top part of the triangle down along a flat crease (the darker flap). A square and a round hole are punched. Which figure shows the opened sheet?

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