parallel - Theorem: If two lines are cut by a transversal so that the alternate exterior angles are congruent, then these lines are parallel. Example: which lines must be parallel if <3 = 28? Solution: 23 and 28 are the alternate exterior angles formed when lines c and d are cut by transversal b. Thus, c | d. an

Advanced Engineering Mathematics
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ISBN:9780470458365
Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
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Theorem: It two lines are cut by a transversal so that the alternate exterior angles are congruent, then these lines are parallel. Example: which lines must be parallel if 23 = 28? Solution: 23 and 28 are the alternate exterior angles formed when lines c and dare cut by transversal b. Thus, c ll d.
parallel
Theorem: If two lines are cut by a transversal so that the alternate exterior
angles are congruent, then these lines are parallel.
Example: which lines must be parallel if 23 = 48?
Solution: 23 and 28 are the alternate exterior angles formed when lines c
and d are cut by transversal b. Thus, c | d.
a
colla
=89
C←
d←
12
b^
3 4
56
8
Transcribed Image Text:parallel Theorem: If two lines are cut by a transversal so that the alternate exterior angles are congruent, then these lines are parallel. Example: which lines must be parallel if 23 = 48? Solution: 23 and 28 are the alternate exterior angles formed when lines c and d are cut by transversal b. Thus, c | d. a colla =89 C← d← 12 b^ 3 4 56 8
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