ICSE Class X Math 2016 Solved Paper

In the given figure below, AD is a diameter. O is the centre of the circle. AD is parallel to BC and ∠CBD=32∘. Find:

Question : 10

Total: 57

∠AOB

Solution:

∠AOB=2∠ODB
(angle at the centre is twice the angle at remaining circumference)
=2×32=64∘

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