Solve this:

13. Find the value of x in given figure. 

Let AB be the arc which subtends X and 30o
Therefore X=60o (ANGLE SUBTENDED BY AN ARC AT THE CENTRE IS DOUBLE THE ANGLE SUBTENDED BY IT AT ANY POINT ON THE REMAINING PART OF THE CIRCLE)
 
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I can not understand your answer
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AB are the radius from point O on the circle
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OA and OB are the radius
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A and B are the points
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X =60 because angle subtended theorem
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What are you looking for?