What is the relationship between 4, 16, and squares?

Need this asap if anyone can i would be very grateful. if you could show workings that would really

If you are trying to move an attached term across the equal sign (=), what operation would you use to move it?

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