Longitude and latitude lines are perpendicular to each other. Most road intersections in major cities are set up in a grid, making the cross streets perpendicular.
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this is one example of concurrent line .concurrent line- 3 or more lines that intersect in a certain point .
roads
There are very few real life examples of nonagons. The only examples that I can think of are a few coins.
"Examples of schematic diagram of the real number system?"
It makes it easy to under stand the measurement of the graph.