A square sheet is folded along the diagonal from top-left to bottom-right (upper-right half down), and then the right corner of the triangle is folded over along an upright crease (the darker flap). A right-pointing and an up-pointing triangle are punched. Which figure shows the opened sheet?

Question

Accepted Answer

(b). Undo the upright fold: the triangle on the flap gets a twin to its right, now pointing left. Undo the diagonal fold: every triangle gets a twin across the diagonal, where up and left swap and right and down swap: (b).

A square sheet is folded along the diagonal from top-left to bottom-right (upper-right half down), and then the right corner of the triangle is folded over along an upright crease (the darker flap). A right-pointing and an up-pointing triangle are punched. Which figure shows the opened sheet?

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