Plzz ans fast!!!
Q). If fig, if O A B = 40 ° , then find A C B .

Dear Student,

Here is the solution of your asked query:

Considering O as the center of the circle.OA=OB   {radius of circle}So, OBA=OAB = 40°    {Angles opposite to equal sides are equal}Now in AOB, we have;OBA+OAB+AOB=180°40°+40°+AOB=180°AOB=180°-80°=100°And we know that angle substended by an arc at the center is double the angle sustended by it at any point on the circle.So, ACB=2AOB = 2×100°=200°Therefore, ACB=200°
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