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Question

In a ΔABC, D is midpoint of BC; AD is produced upto B so that DE =AD
i)Prove that ΔABDΔBCD
ii) AB =EC
iii) AB||EC

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Solution


In ΔABD & ΔECD
i) BD =CD (Given)
ADB=EDC (Vertically opposite angles)
AD =ED (Given)
ΔABDΔECD are concruent by SAS condition.
ii) AB =EC (CPCT)
iii) BAD=DEC(CPCT)

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