Question

if o is the center find angle aob if acb = 100° please answer fast
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Answer 1

In given figure ,O is the center of circle .∠AOB=1000

Then external ∠AOB=3600−1000=2600

We know that the angle subtended by an arc at the center of a circle is twice 

the angle subtended by the same arc at any other point on the remaining part of the circle.

 Arc ∠ADB=21Ex∠AOB=21×260=1300

Answer 2

Step-by-step explanation:

Arc ∠ADB= 1/2 Ex∠AOB= 1/2 ×260=130 °

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