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BC is a diameter of a circle with center at O. If ∠ABO=30∘ and ∠OAD=40∘, find the measure of ∠COD.

 

 

 Jul 24, 2020
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Extand line AO to the other side of the circle   DAO then intercept 80 degrees of a half circle

    angle b intercepts anothe 60 degrees of this half cirlcle

        angle cod is a central angle and intercepts the rest of the half circle   180  - 80 - 60 = 40 degrees

 Jul 24, 2020

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