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