Pls help it’s for a test I need this correct IM GOING TO GIVE U ALOT OF COINS OR WHAT EVER ITS CALLED

The product of two negative rational numbers is always zero sometimes zero never zero

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

3.4a=57.8 what is the the value of a