1.

A(3x_(1), 3y_(1)), B(3x_(2), 3y_(2)), C(3x_(3), 3y_(3)) are vertices of a triangle with orthocentre H at (x_(1)+ x_(2)+ x_(3), y_(1)+y_(2)+y_(3)), then the angleABC=

Answer»

`(PI)/(2)`
`(pi)/(3)`
`(pi)/(6)`
`(pi)/(4)`

ANSWER :B


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