explain step by step.
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1234
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12345
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Correct option is B.) 2π
We know that the sum all angles of triangle
=180° = π
In △ABC,
A+B+C=π -----> (1)
In △DEF,
D+E+F=π------>(2)
Therefore, the sum of the angles at the vertices = A+B+C+D+E+F= π+π = 2π
Hence, this is the answer.
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