In the adjoining figure, the value of $∠ A + ∠ B + ∠ C + ∠ D + ∠ E + ∠ F$ in degrees is
___

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Solution

From $△$ ABC;

$∠ A + ∠ B + ∠ C = 180^{\circ}$

From $△$ DEF;

$∠ D + ∠ E + ∠ F = 180^{\circ}$

So, adding these

$∠ A + ∠ B + ∠ C + ∠ D + ∠ E + ∠ F = 1 80^{\circ} + 180^{\circ} = 360^{\circ}$

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In the adjoining figure, the value of $∠ A + ∠ B + ∠ C + ∠ D + ∠ E + ∠ F$ in degrees is

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