What is the volume of a trapezoid that has bases of 18 and 23 and a height of 12

If angle 2=3x +1 and angle 3=2x +4what is angle 2

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 is the area of the shaded sector?