4 and 2 are vertical and the lines are straight lines so 180 degrees. To find 4 you need to subtract 25 from 180 which is 155 degrees.
3 and 1 are vertical too, so 25 degrees
7 and 5 are similar to 1 and 3, so 7 and 5 are 25 degrees.
8 and 6 are like 4 and 2 too, so 8 and 6 are 155
1 - 25
2-155
3-25
4-155
5-25
6-155
7-25
8-155
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Hope this helped.
