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Nguyễn Mạnh Hùng 28/08/2018 at 07:52We have 3 straight points: (A;E;B);(B;G;C);(C;D;H);(A;I;D);(A;O;C);(I;O;G);(D;O;B);(E;O;H). So the middle point is: E;G;H;I;O
Huỳnh Anh Phương selected this answer.
We have 3 straight points: (A;E;B);(B;G;C);(C;D;H);(A;I;D);(A;O;C);(I;O;G);(D;O;B);(E;O;H). So the middle point is: E;G;H;I;O
Huỳnh Anh Phương selected this answer.