Q. 365.0( 1 Vote )

# In the given figure, ∠OAB = 75°, ∠OBA = 55° and ∠OCD = 100°. Then ∠ODC = ?A. 20°B. 25°C. 30°D. 35°

In triangle AOB,

AOB =180o – 75o – 55o

= 50o

AOB = COD = 50o(Opposite angles)

Now in triangle COD,

ODC =180o – 100o – 50o

= 30o

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