48.
Skew lines; the planes are flying in different
directions and at different altitudes.
49.
CG
,
DH
,
EI
50.
DE
,
FG
,
HI
,
GH
,
BF
,
DH
,
EI
51.
No; plane
ADE
will intersect all the planes if they
are extended.
52.
Sample answers: parallel bars in gymnastics,
parallel port on a computer, parallel events, parallel
voices in a choir, latitude parallels on a map
53.
Infinite number; consider any line through
P
in
any plane that does not contain .
54.
1
55.
Sample answer: Parallel lines and planes are used
in architecture to make structures that will be
stable. Answers should include the following.
•
Opposite walls should form parallel planes; the
floor may be parallel to the ceiling.
•
The plane that forms a stairway will not be
parallel to some of the walls.
56.
A
57.
The elements of M are 15, 18, 21, 24, 27, and 30.
The elements of P are 16, 20, 24, and 28. The
numbers that are in P but not in M are 16, 20,
and 28. Select any one of these three numbers.
Page 131
Maintain Your Skills
58. Given:
m
ABC
¬
m
DFE
m
1
¬
m
4
Prove:
m
2
¬
m
3
Proof:
59.
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 Fall '10
 Dr.Zhan
 Calculus, PreCalculus, Harshad number, parallel port, PR XZ

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