I have a problem with finding the center coordinates of each side in an equilateral triangle. I've linked an image below that shows exactly which coordinates I'm after.
I understand that I can work out the height of then triangle by using pythagoras theorem. I can split the triangle down the middle and calculate the opposite of one of the triangles.
However, I can't figure out how to work out the coordinates marked with a "?"
Is there any formula I can use to work this out? The center part of the triangle would be it's origin at (0,0) and the sides would be 3 units each.