please answer me I will mark you as brianlist answer . but with correct answer and step by step please answer
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angle B=40⁰ and C =180⁰-60⁰+40⁰=80⁰
1/2 of B and C =20⁰&40⁰
so, O =180⁰-20⁰+40⁰
O=120⁰
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