1. The ray
The point P divides the line into two opposite rays. The point P is the origin of the two rays.
2. The segment
Points A and B determine a portion of the line s that is called segment.
Answer these questions:
The s is......
Points A and B form...
The point A forms......
3. Sum of segments
The segments can be added. We must put them on a line one behind the other.
In this case the segment AB + CD = AD
The segment AD =
The segment AB =
The segment CD =
4. Subtraction of segments
If we have the segment MN and we want subtract the segment PQ, we will form in a way that they start at the same point M. The segment QN is the difference.
The segment QN =
The Segment MN =
The segment MQ =
5. Multiplication of segments
To multiply the segment AB by 3, we will take a line and we will put three times that segment one after the other.
6. Consecutive and concatenated segments
The segments AB and BC are not on the same line and they are called concatenated.
The segments PQ and QR are called consecutive because they are in the same line.
Answers to these exercises:
The segments PQ and QR are......
The segments AB and BC are......
The segments BC and AB are......
The segments QR and PQ are......
7. Draw parallel lines
We see two ways to draw parallel lines with a triangle and a ruler.
In the first case they are the lines a, b and c. In the second case, they are the lines m, n and p.
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®Arturo Ramo García.-Record of intellectual property of Teruel (Spain)
No 141, of 29-IX-1999
Plaza Playa de Aro, 3, 1º DO 44002-TERUEL