We just don't use the definite article in constructions of that sort ("refer to...", "please see...", etc.) for words relating to parts of written works, including: paragraph, section, page, chapter, unit, and volume.
When you say "figure 1" you are essentially giving a name to that figure and therefore "the", the definite article, is not used. When I removed the names of the page, the chapter and the volume in the examples above, it dictated use of the definite article.
I have some other questions. How would you use slash in a sentence?
For example Licence/for making Licence, do we need to put a space in between the slash (Licence / For making licence) or there is no need to put a space at all.
I do understand that there should be no space to indicate something as follows;