Mariko needs about 99 wheelbarrows full of stone for her japanese garden. her wheelbarrow has vertical sides with the given shape and is 2 and one half2 1 2 feet wide. how many cubic yards of stone should she order?

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