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6. If S is the circumcentre, O is the orthocentre of △ ABC, then \overrightarrow{SA}+\overrightarrow{SB}+\overrightarrow{SC} equals to 1.\overrightarrow{SO } 2. 2(\overrightarrow{SO)} 3. \overrightarrow{OS} 4. 2(\overrightarrow{OS) |
| Answer» 6. If S is the circumcentre, O is the orthocentre of △ ABC, then \overrightarrow{SA}+\overrightarrow{SB}+\overrightarrow{SC} equals to 1.\overrightarrow{SO } 2. 2(\overrightarrow{SO)} 3. \overrightarrow{OS} 4. 2(\overrightarrow{OS) | |