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Junior one math problem: How many pairs of internal angles are there in 7-2-9? Which two straight lines are formed by which pair of internal dislocation angles?
* * * There are 6 pairs, namely:

1-4,8-3 (AC and AD are cut by BE)

3-6, 2-5 (BC and BC were cut by AD)

8-7(CA and CB are cut by BE)

6-9(CA and CB are intercepted by AD)

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