C6. Geometry (lines)

​- A point has no size; it shows the position of something.

​- Points are named by capital letters.

​- A line has no beginning and has no end.

- It contains the points A and B, so it is named "line AB"; written: AB

​- A line with one end point.

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​- It contains the point A and B, so it is named "ray AB"; written: .

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​- The end point is always named first.

​- A line segment has two end points.

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​- It contains the point A and B, so it is named "line segment AB"; written: .

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​- It is the shortest distance between two points.

​- These are the lines that never meet.

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​- To show that lines are parallel, we draw arrow heads.

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​- It is written, PQ RS.

​- Lines which are not parallel, they meet and cross.

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​- At that point they make angles.