The white triangle to the right can be changed by moving the three red dots.
What color are the medians?
What color are the altitudes?
What happens when you get all three to match up with each other (become coincident) for one of the angles?
What happens when all three are coincident for two of the angles?
Which of the lines can be outside the triangle? For what kind of triangle does this happen?
What do you notice about the intersections of the same colored lines? Do a web Search to find the namess of those intersections.