A paper square is folded along the diagonal from top-left to bottom-right, lower-left half up; then the bottom tip of the triangle is folded up along a flat crease (the darker flap). A triangle pointing up and a round hole are punched. Which figure shows it opened?

Question

Accepted Answer

(c). Undo the flat fold: the triangle on the flap gets a twin below the crease, pointing down. Undo the diagonal fold: every triangle and hole gets a twin across the diagonal, where up turns to left and down to right: (c).

A paper square is folded along the diagonal from top-left to bottom-right, lower-left half up; then the bottom tip of the triangle is folded up along a flat crease (the darker flap). A triangle pointing up and a round hole are punched. Which figure shows it opened?

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