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Question

If AOC ODB, then measure of OBD is
759810_eaefac2f66e44b428952dd748dc8135b.JPG
  1. 100o
  2. 50o
  3. 80o
  4. None of these

A
None of these
B
100o
C
50o
D
80o
Solution
Verified by Toppr

In OAC, we have
OAC + OCA + AOC = 180o (Angle sum property)
OAC + 60o + 20o = 180o
OAC = 180o (60o + 20o) = 180o 80o = 100o
As AOC ODB
Therefore, OAC = OBD (By CPCT)
So, OBD = 100o

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