The intersection of the three [b]altitudes[/b] of a triangle form the [b][color=#a64d79]orthocenter[/color][/b] of that triangle.
If you think you found it, explain how you did it and why you think it's the [b][color=#a64d79]orthocenter[/color][/b]. If you're not sure, just explain what you tried!
1. Select one side of the triangle and create a line that is both perpendicular to that side and goes through the opposite vertex.[br][br]2. Repeat this step for each side so that you have the three [b]altitudes [/b]of the triangle.[br][br]3. Find the intersection of the three [b]altitudes[/b], and label it [b][color=#a64d79]O[/color][/b] for [b][color=#a64d79]orthocenter[/color][/b].
Was your construction method similar?