Final answer:
Without additional context or information on geometric properties, it is not possible to determine the measure of ZBCA.
Step-by-step explanation:
The measure of ZBCA is not provided within the context of the student's question. Therefore, without additional information, such as the type of geometric figure it pertains to or any related angles or side lengths, we are unable to confidently deduce the answer. To accurately determine the measure of angle ZBCA, details about the geometric properties or relationships within the figure are necessary.