Rekha folds a square sheet right over left, then bottom up over top, and finally folds the small square along its diagonal from top-right to bottom-left, the top-left half going over. She punches a triangle pointing up and a round hole. Which figure shows the opened sheet?

Question

Accepted Answer

(a). Undo the diagonal fold: the up triangle's twin points right. Undo the bottom-top fold: copies below, ups become downs. Undo the right-left fold: copies on the right, lefts and rights swap. Sixteen holes in mirror pairs: (a).

Rekha folds a square sheet right over left, then bottom up over top, and finally folds the small square along its diagonal from top-right to bottom-left, the top-left half going over. She punches a triangle pointing up and a round hole. Which figure shows the opened sheet?

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