∠D + ∠A + ∠C + ∠B = 360°. Or, the sum of angles of a quadrilateral is 360°. This is the angle sum property of quadrilaterals.
∠D + ∠A + ∠C + ∠B = 360°. Or, the sum of angles of a quadrilateral is 360°.
This is the angle sum property of quadrilaterals.
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