the point
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On the number line put a colored in circle at 5. An arrow goes to the left from that and has an arrow point on the end of it
A ray
The starting point in a race is called the starting line. The end point of a race is called the finish line.
Draw open circles at the points 3 and 4. From the point 3 draw a line to the left, with an arrow pointing left. From the point 4, draw a line to the right with an arrow pointing right.
The extreme point is called a vertex.