Q: Are paper sizes all based on a single aspect ratio of the square root of 2? ¶
A: Yes, or approximately 1:1.4142.
Q: Are paper sizes currently standard in the United States and at least in the Philippines? ¶
A: Yes, and Colombia and Chile.
Q: Are paper sizes a de facto standard? ¶
A: Yes.
Q: Are paper sizes included in Cascading Style Sheets : JIS-B4? ¶
A: Yes, and JIS-B5.
Q: Are paper sizes included in Cascading Style Sheets : A3? ¶
A: Yes, and A4, A5, B4, B5.
Q: Were paper sizes defined by the sheet name and the number of times it had been folded? ¶
A: Yes.
Q: Is a paper size common in Southeast Asia? ¶
A: Yes.
Q: Are paper sizes called "DIN A4" in everyday use in Germany and Austria? ¶
A: Yes.