The segments AC and BD intersect at point O. Prove the equality of triangles BAO and DCO if it is known that the angle BAO = the angle DCO and AO = CO.
Triangles BAO and DCO are equal in the second sign of equality of triangles: in side and two adjacent corners. According to the condition: angle BAO = angle DCO, AO = CO.
The angle AOB is equal to the angle DOC – vertical angles.
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