Final answer:
To calculate the measure of angle 6 with parallel lines b and c, we would use properties of parallel lines. Without a figure or information on angles' relationships, we can't provide a definitive answer.
Step-by-step explanation:
The question pertains to finding the measure of angle 6 given that lines b and c are parallel. None of the information provided in the reference seems to directly answer the student's question. To determine the measure of angle 6, we would typically need to apply the properties of parallel lines, such as corresponding angles, alternate interior angles, or consecutive interior angles which are equal, or supplementary, respectively. However, without additional context, like a figure or more information about the angles' relationships to one another, it is not possible to give a definitive answer to this question.