James defines an angle as "a figure consisting of two rays." His statement is not precise enough because he should specify that the rays must be collinear
the rays must form a right angle
the rays must have a common endpoint
the rays must continue in one direction forever

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