A(3x1,3y1),B(3x2,3y2),C(3x3,3y3) are vertices of a triangle with ortho – InterviewSolution

1.	A(3x1,3y1),B(3x2,3y2),C(3x3,3y3) are vertices of a triangle with orthocentre H at (x1+x2+x3,y1+y2+y3) then the ∠ABC
Answer» $A (3 x_{1}, 3 y_{1}), B (3 x_{2}, 3 y_{2}), C (3 x_{3}, 3 y_{3})$ are vertices of a triangle with orthocentre H at $(x_{1} + x_{2} + x_{3}, y_{1} + y_{2} + y_{3})$ then the $∠ A B C$

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