A triangle has a perimeter of 13x2 – 14x + 12. If one of its sides measures 17x – 7, and another side measures 3.x2 + 5 what is the measure of its third side? ​

The figure shows triangle def and line segment bc, which is parallel to ef: triangle def has a point b on side de and point c on side df. the line bc is parallel to the line ef. part a: is triangle def similar to triangle dbc? explain using what you know about triangle similarity. part b: which line segment on triangle dbc corresponds to line segment ef? explain your answer. part c: which angle on triangle dbc corresponds to angle f? explain your answer. asap