parallel lines are everywhere. They are on the desk you are at, the windows, the very monitor you are looking at. Any two lines that run next to each other are parallel, and without this, very few things would be straight.
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Construction, engineering, drawing, and architecture all use parallel and perpendicular lines. Other than that, it is an important topic because you are learning how to apply the language and tools of mathematics to an intuitive system. These topics have proven important in the history of human kind and also many before you have shown that by learning about parallel and perpendicular lines, one learns how to use math and logic. It is doubtful that you can make a living off of parallel and perpendicular lines, but if you can't understand parallel and perpendicular lines, then I worry about your future.
Ebcause you use it in architacture and construction and stuff
adding subracting mulitplying and counting everyday
how is x-rays used in our everyday lives
I use them everyday with a spread sheet.