CBSE Class 9 Answered
triangles
Asked by priyankmalukar | 08 Sep, 2009, 10:55: PM
Expert Answer
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To prove OB = OC we need to prove that 
ODB 
OEC
Now, ODB 
OEC
Since 
DOB = COE ......(1)
and DBO = ECO .......(2)
Now in DBC and EBC
ODB = OEC (By cpct)
ABC = ACB (sides of an isoceles triangle)
BC is common
DBCEBC (AAS congruency)
BD = EC .......(3)
DC = EC
ODB OEC (from 1,2,3)
⇒ OB = OC
Similarly do the (ii) part.
In case you get stuck post each query individually.
Answered by | 09 Sep, 2009, 09:05: AM
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