What is the size of 4 A4 papers stuck together?

Answer 1

The size of 4 A4 papers stuck together would be equivalent to the dimensions of a single A4 paper in terms of length and width, but the thickness would be four times that of a single sheet of A4 paper. A standard A4 paper measures 210 mm by 297 mm, so when four sheets are stuck together, the dimensions would still be 210 mm by 297 mm, but the thickness would be approximately 0.4 mm (assuming each sheet is 0.1 mm thick).

Answer 2

If you mean four sheets placed in a 2 x 2 grid - that's A2 size.

Answer 3

Four A4s together is A2 (420mm x 594mm).