Nguyễn Khánh Ly
03/07/2017 at 11:18-
Nguyên Hạo 03/07/2017 at 15:27
The intersection of sements a and c is B because they go through point "B"
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Nguyễn Khánh Ly 03/07/2017 at 12:09
why their interestion is B
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Their intersection is B