What is the sum of the geometric series?

Which of these triangle pairs can be mapped to each other using two reflections?

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

The given diagram shows the parts of a right triangle with an altitude to the hypotenuse. using the two given  measures, find the other four.