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

   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.

   Answer:

   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.

   Answers:

    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:

   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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