A square sheet is folded along the diagonal from top-right to bottom-left, its upper-left half laid over the lower-right half. A triangle pointing left and a round hole are punched. Which figure shows the opened sheet?

Question

Accepted Answer

(b). A mirror across this diagonal turns 'left' into 'down' and moves each hole to where its distances from the right and bottom edges are swapped. The left-pointing triangle's twin points down, in the upper-left half: (b).

A square sheet is folded along the diagonal from top-right to bottom-left, its upper-left half laid over the lower-right half. A triangle pointing left and a round hole are punched. Which figure shows the opened sheet?

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