1. in the diagram, which of the following segments is congruent to segment ab? segment ad
segment ac
segment cd
segment cb

2. in the diagram, if segment ad has a length of 6 cm, then the length of segment cd must be which of the following?
less than 6 cm
greater than 6 cm
equal to 6 cm
cannot be determined from the given information

3. if point b is between points a and c, and ab = 6 and bc = 9, then what is ac?
3
12
15
18

113.42

i hope that is right.

step-by-step explanation:

answer: the proof is mentioned below.

step-by-step explanation:

since, given:   lines bc = ef

prove:   lines ac > ef

          statements                                           reason

1. bc=ef                                           1. given

2. ac= ab+bc                                 2. because b is the point between the  

                                                            line segment ac

3.   ac > bc                                       3. because if a line segment is equal to

                                                          the sum of two line segments then it is

                                                          always greater then each of these

                                                          individual line segments

4. ac > ef                                         4. by equality property.