The lines crossing line c are not parallel to each other in which it is difficult to get the correlation between the angles given. In this case, angles 3 and 6 are not interior angles since lines a and b are not parallel in the first place. so the most sensible answer here is C. consecutive interior angles.
If the length is 4 meter more than the width than that means whatever the width is you must add 4 to it, in this case the width is 9 so add 4 to it which equals 13. If the length matches your answer it is the correct choice.
