Answers

2016-03-02T17:33:10+05:30
Given that please see the attachment for answer 
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2016-03-02T17:38:25+05:30
We know that, angle subtended by an arc of a circle at centre is double the angle subtended by the arc in alternative segment . hence,
angle AOB = 2 angle ACB 
Aangle AOB = angle ADB 
so. angle ACB= ADB
REFLEX angle AOB = 2 angle ACB
and reflex angle AOB =2 angle ADB
2 angle ACB= 2 angle ADB
angle ACB = ADB

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