A square sheet of paper is folded along the dotted line in the direction of the arrow, and holes are then punched through all the layers, as shown in the figures. How will the sheet look when it is opened out?
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) →
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 right half is folded over onto the left half, so opening it copies each of the 2 holes across the vertical fold line. So the opened sheet has 4 holes, placed symmetrically about the fold line.
Option (1) — 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 a horizontal line through the middle instead of across the vertical fold line, so they are in the wrong places.
Option (4) — Incorrect. It has an extra hole: the opened sheet has 4 holes, this option shows 5 holes.