Study: a) A line extends infinitely in two directions. b) A ray has a definite initial or end-point, therefore arrows are drawn on both ends. c) A line segment is a part of a line which is bound by two distinct end points.

Here are the solutions to the questions:

2. Complete:

• a) A line has no definite end-points.
• b) I am a line.
• c) A ray has one definite end-point.
• d) I am a ray.
• e) A line segment has two definite end-points.
• f) I am a line segment.

4. True or False?

• a) Parallel lines must be the same length.
  • False. Parallel lines can be of different lengths.
• b) Perpendicular lines will never intersect.
  • False. Perpendicular lines intersect at a right angle.

5. Which pairs of lines below are:

• 5.1 parallel to one another?
  • Pairs A and E are parallel lines. They stay the same distance apart and never intersect.
• 5.2 perpendicular to one another?
  • Pairs C and F are perpendicular lines. They intersect at a right angle.
• 5.3 intersecting lines?
  • Pairs B, C, D, and F are intersecting lines. They cross each other at a point.