Side angles — task. Mathematics CBSE, Class 7.

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Which of the following expressions are true ?

$∢ 4 + ∢ 2 = 180 °$
$∢ 1 + ∢ 2 = ∢ 3 + ∢ 4$
$∢ 1 + ∢ 2 + ∢ 3 + ∢ 4 = 360 °$
$∢ 1 + ∢ 2 + ∢ 3 + ∢ 4 = 180 °$

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