DÀNH CHO GIÁO VIÊN

ASSIGNMENTS FOR TEACHERS

Instructor: Dr. Tran Nam Dung Problem 1. There are 20 lines in the plane, without any two parallel lines or any three concurent lines. How many regions do these lines divide the plane into? There are 20 circles in the plane, each two of them shares two different common points and no point lies on more than two circles. How many regions do these 20 circles divide the plane into? […]

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