In paragraph 3 what word or phrase gives you a clue to what the word perpendicular means

Can someone me answer this english question

Plz halp. which statements are true about theme? check all that apply. 1.) themes are observations about life. 2.) themes can be stated in a sentence. 3.) themes and topics are the same thing. 4.) themes are messages a text conveys about a topic. 5.) examples of themes include loyalty, corruption, and greed. 6.)themes are rarely stated directly and need to be inferred by the reader.

Besides the revisions listed in the paragraph, what else can deepak do to strengthen his paper?