Answer:
- perpendicular bisector
- angle bisector
- altitude
- median
Step-by-step explanation:
In each case, "how do you know" is answered by comparing the line to the definitions of the various types of lines.
1. perpendicular bisector -- a perpendicular segment that divides the base into two equal parts
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2. angle bisector -- divides the vertex angle into two equal parts
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3. altitude -- a line from the opposite vertex perpendicular to the side
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4. median -- a line from the opposite vertex to the midpoint of the side
