Geometry: Common Core (15th Edition)

Published by Prentice Hall
ISBN 10: 0133281159
ISBN 13: 978-0-13328-115-6

Chapter 1 - Tools of Geometry - 1-2 Points, Lines, and Planes - Lesson Check - Page 16: 6

Answer

Because a line extends infinitely in two directions, the two arrowheads are used.

Work Step by Step

By definition, a line extends infinitely in both directions, so this makes sense.
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