What is the Default Font and Font Size?

What is the default font and font size when typing in an rtf box?

I tried typing the same word next to other words (ex. the) and then changing the font and font size for it and it looked like Arial 10, but when I saved it that way, the rtf boxes did not match the drop down box fields in terms of font and font size.

If I copy paste something in I want it to match the rest of my fields (ex. drop downs are in the default font and font size.)

Thanks!