Answer:
18
alt exterior, 6 and 2
5 and 1
alt interior, 7 and 3
4 and 8
same side interior, 7 and 8
4 and 3
corresponding 5 and 3, 6 and 8, 7 and 1, 4 and 2
19
congruent 6=4 5=7 3=1 2=8 5=7
suplamentery 6 and 5
7 and 4
8 and 3
1a and 2
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