2. The sides of the triangle DEF are parallel to the sides of the triangle ABC and they have to pass to one midpoint each.
3. Calculate the slopes of the sides of triangle DEF:
4. Determine the equations of the sides of triangle DEF:
The line passing through C is parallel to AB:
The line passing through B is parallel to AC:
The line passing through A is parallel to BC:
5. Calculate the coordinates of the points of intersection between these three lines to get the ponts D, E, F.