Which angle in aabc has the largest measure?

It is b) angle B.

The opposite angles of opposite sides are proportional to each other. So the smallest side’s opposite angle will be the smallest angle, and in this case, since the largest side is 12, the opposite angle, B, will be the largest angle.

Also, make sure to check to see if the question is the right subject, hope this helps

Ther are many reasons.. is it a multiple choice?