Two diagonal folds turn a paper square into a small triangle: first the upper-right half comes down (top-left to bottom-right crease), then the lower-right half goes up along the other diagonal. A right-pointing triangle and a diamond are punched. Which figure shows the opened square?

Question

Accepted Answer

(b). Undo the second fold: twins across the top-right to bottom-left diagonal, where right becomes up. Undo the first: all four get twins across the other diagonal, where right becomes down and up becomes left. Eight holes: (b).

Two diagonal folds turn a paper square into a small triangle: first the upper-right half comes down (top-left to bottom-right crease), then the lower-right half goes up along the other diagonal. A right-pointing triangle and a diamond are punched. Which figure shows the opened square?

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