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Mathematics 21 Online
OpenStudy (anonymous):

given : AB intersects CD at O prove : AC is congruent to BD

OpenStudy (anonymous):

|dw:1362010276013:dw| THIS IS THE IMAGEN OF THE CIRCLE

OpenStudy (anonymous):

angles AOC and BOD are same. OA,OC,OB,OD are all same so triangle AOC BOD are same. so AC and BD are same

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