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3 times, at 0,180 & 360 degrees Is it not twice? (two times?) The third 360 degrees is the start of the next cycle? or the first 0 degrees was the end of the previous cycle?
A girl can start her menstrual cycle from when she is about 9 years old any where through to when she is 16 years old.
A cycle is a closed path such that the end vertex of the final edge is the start vertex of the first edge.
Tri Pod Cycle
The average menstrual cycle lasts 28 days, from the start of menstruation to the start of the next menstruation. The "bleeding phase" typically lasts 5-7 days.