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Chapter 19 - part A
Vocabulary
Vocabulary | Definitions |
---|---|
line | a straight path extending infinitely in both directions |
point | an exact location in space |
line segment | a part of a line with two endpoints |
ray | a part of a line with one endpoint that continues in one direction |
angle | two rays with a common endpoint |
right angle | an angle that measures 90˚ |
degree (˚) | a unit of measure for angles |
acute angle | an angle less than 90˚ |
obtuse angle | an angle greater than 90˚ and less than 180˚ |
intersecting lines | lines that cross and form angles |
perpendicular lines | lines that cross to form right angles |
parallel lines | lines that never cross |