The answer choice which could be the length of side BC is; BC < 12.
Which answer choice could be the length of side BC?
It follows from the task content that the possible length of the side BC is to be determined.
Since, the sides given AB and BC both have length sum equal to 12. It follows from the triangle inequalities that the length of the third side must be less than the sum of lengths of the other two sides.
Read more on triangle inequalities;
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