ACtE08 · Chapter 8Demo2 · Set 1🏛️ Past Licensure QuestionID: f419c413
Under the ISO 216 international paper standard, what is the exact aspect ratio of width to length for standard A4 paper?
Under the ISO 216 international paper standard, what is the exact aspect ratio of width to length for standard A4 paper?
Multiple Choice Options
- A✓ Correct Option
1 : √2
- B
1 : 2
- C
√2 : 1
- D
2 : 1
Detailed Technical Solution & Explanation
The ISO 216 paper standard is based on the Lichtenberg ratio of $1 : \sqrt{2}$ (approximately ). Standard A4 paper has dimensions of . The ratio of the shorter side to the longer side is:
This geometric property ensures that when a sheet is folded or cut in half parallel to its shorter side (producing an A5 sheet), the resulting sheet retains the exact same aspect ratio ().
Option Analysis:
•
Option A (1 : √2): Correct; defined by .
•
Option B (1 : 2): Incorrect; would produce an aspect ratio of 0.5, which does not preserve proportions upon halving.
•
Option C (√2 : 1): Incorrect; inverted orientation (length to width).
•
Option D (2 : 1): Incorrect.
Reference: Demo2 · Set 1NEC Licensure Syllabus