Doubt from coordinate geometry

15736196156834911229784875868864 ques 17 and 18

#17. Hint: Show that orthocenter of \triangle BCH is A

  1. Hint: Use the fact that centroid G divides HO in the ratio 2:1 to find G. Then use the fact that centroid divides median in ratio 2:1 to find midpoint of BC
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15736591604185571205608153107956 3115736592574854245922028115424922 27,28,36

Anyone??

You arent likely to get answers if you dont make the effort of posting the questions in a way that can be read easily. One of the images is inverted, the other is too small to make out. Even the previous one was sideways.