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Geometry
Pairs of Lines
Parallel lines are _____________________ lines that DO NOT ______________________.
Parallel symbol is _________.
Thick arrows drawn on the lines are used to indicate that the lines are parallel.
Sketch:
With symbols we denote, ________________________.
Perpendicular lines are lines that intersect to form a ____________________________.
The symbol ________means “perpendicular to”.
________ right angles are formed.
Sketch:
With symbols we denote, ________________________.
Obliques lines are lines that _________________, but DO NOT form a __________________.
Sketch:
Skew Lines:Two lines are _______________if they DO NOT ________________ and are not in
the same ________________(not coplanar).
All planes are either ___________________ or _______________________.
Two planes that don’t intersect are called ___________ planes.
A
Example:
Use the figure to the right to answer the following
D
B
C
a. Find 2 planes that do not intersect.
E
F
b. Name all segments that are parallel to AD
c. Name all segments that intersect AD
H
d. Name all segments that are skew to AD
e. Name all planes that are parallel to plane BCG.
Examples: ** Pretend the segments on the prism are parts of lines.
1) What are the lines parallel to CD?
2) What lines are perpendicular to CD?
3) What lines are skew to CD?
4) Name the parallel plane to CDA.
5) Name the plane perpendicular to CDA.
G