In latex documentation, I found this:
Then I searched that what does bk mean, and I found this:
After seeing this I thought that bk means book. And textwidth equals to 4.5in in
book class (font size 10pt). Then I compiled a pdf with papeeria:
And this equals to 345pt, but the docs said it would be 345 if it is not
book class. But it is still 345pt. Then I thought it might be possible that 4.5in equals to 345pt. But I found this:
Can someone tell me what I am understanding wrong?