Greg had a rectangular piece that was 80 mm long and 40 mm wide. He cut the paper in half. What is the Area of the each half of the paper in the square milimeters? (answers are in the picture)​

Me because some of question i don’t understand

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

What expression is equivalent to (84+16)