How to find the orthocenter of an obtuse triangle

Find the equations of 2 segments of the triangle Once you have the equations from step #1, you can locate the slope of the corresponding perpendicular lines. You will use the slopes you have found from step #2, and the corresponding opposite vertex to find the equations of the two lines. Once you have the equation of the two lines from step #3, you can solve the corresponding x and y, which is the coordinates of the orthocenter.