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O is the orthocentre of triangle ABC where P,Q,R are the midpoints of OA, OB ,OC. Prove that O is also the orthocenter of triangle PQR.

O is the orthocentre of triangle ABC where P,Q,R are the midpoints of OA, OB ,OC. Prove that O is also the orthocenter of triangle PQR.

Grade:9

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