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Points, lines, rays and segments
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Learn it A point is a location. A line goes on forever both ways; a ray starts at one point and goes on forever one way; a segment has two endpoints. Any 2 points make exactly one line.
Example: How many segments join pairs of 6 points on a line?
- Each segment needs 2 endpoints.
- Choose 2 of 6: $\binom{6}{2} = \frac{6 \times 5}{2}$.
- $= 15$ segments.
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