The figures show how a square sheet of paper is folded along the dotted line (the arrow shows the direction of folding) and then punched. Which option shows the sheet after it is completely unfolded?
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) →
When a folded sheet is opened, every hole is repeated as its mirror image across each fold line, the last fold being opened first. Here the bottom half is folded up onto the top half, so opening it copies each of the 2 holes across the horizontal fold line. So the opened sheet has 4 holes, placed symmetrically about the fold line.
Option (1) — Incorrect. It has an extra hole: the opened sheet has 4 holes, this option shows 5 holes.
Option (2) — Incorrect. One of the copies is missing: the opened sheet has 4 holes, this option shows only 3 holes.
Option (3) — Incorrect. The holes have been copied across the vertical fold line instead of the horizontal fold line, so they are in the wrong places.