Question

In which figure is point G an orthocenter?

Triangle A B C is a right triangle. Lines are drawn from each point to the opposite side and intersect at point G.
Triangle F D E is shown. Lines are drawn from each point to the opposite side and intersect at point G. The lines cut each side into 2 equal parts.
Triangle L M N is shown. Lines are drawn from each point to the opposite side and intersect at point G. Each angle has a different measure.
Triangle H J K is shown. Lines are drawn from each point to the opposite side to form right angles and the lines intersect at point G.

Answer 1

Triangle H J K. In that figure the lines from the vertices meet the opposite sides at right angles, so they are the altitudes and their intersection G is the orthocenter.