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It would be a straight line of length bc
B.C. years are like negative numbers on a numberline counting down then counting up again once it hits A.D. (A.D. years are positive numbers on a number line)
This depends on what the points are for B, and C.
I assume that points BC is a straight line and that D is the point where the line DE intersects BC. If this is so, and CDE is 55 degress, then BDE is 125 degrees.
It means Before Christ