A piece of paper is folded and a cut is made as shown below. How it will appear when opened?
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) →
The sheet is opened in the reverse order of folding, and at each step every cut is copied as a mirror image across the fold line. A cut on an outer edge stays a notch on that edge, while a cut on a fold line opens into a whole shape.
Opening the second fold (right half) — the half-circle on the left edge appears on the right edge too, and the two triangle cuts are copied into the right half.
Opening the first fold (top half) — the triangle notches on the middle fold line join with their copies to form two diamonds in the middle; the triangles on the bottom edge are copied to the top edge, and the half-circles appear in the top half as well.
