Tristan travaille dans un atelier de réparation de vélos. Sa tâche consiste à ajuster le dérailleur des vélos. Samedi passé il a travaillé 4h34. Combien de dérailleurs a-
t-il ajustés sachant qu'il a besoin de 4 h pour ajuster un dérailleur? *
19
16
O 3
1​

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