4) Consider triangles ABC and A'B'C'. Extend side AB to a point D such that A*B*D. Extend side A'B' to a point D' such that A'*B’*D'. Let |AB| = |A’B’|, |BD| = |B'D'|, |AC|=|A'C'|, |BC|=|B'C'. Prove that |CD| = |C'D'|.

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