A tall card is folded left half over right, then top half down, then top half down again. In the small piece a triangle pointing down and a round hole are punched. Which figure shows the opened card?

Question

Accepted Answer

(d). Undo the folds in reverse. Each flat fold flips up and down, so the triangle copies alternate down, up, up, down going up the card; the upright fold copies everything to the left unchanged in direction: (d).

A tall card is folded left half over right, then top half down, then top half down again. In the small piece a triangle pointing down and a round hole are punched. Which figure shows the opened card?

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