Roger mixed 5/8 cup of red paint with 2/5 cup of yellow paint. how much red paint is needed (using the same ratio) if he wants to use 1 cup yellow paint

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