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Defining and Constructing Objects

Defining and Constructing Objects 1.3 - Solution

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Lines in the plane are represented by a line segment with arrows on both ends. We can identify two lines in the diagram: one that goes through points RR and O,O, and one that goes through points FF and L.L.

We can use any two points on a line to name it. Point RR and OO are on the first line, so we can name it RO.\overleftrightarrow{RO}. The order of RR and OO doesn't matter and is, thus, an arbitrary choice. By the same principle, one name for the second line is FL.\overleftrightarrow{FL}.