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→Angle sum property of a quadrilateral
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====== [[Angle sum property of a quadrilateral]]======
====== [[Angle sum property of a quadrilateral]]======
+Sum of the interior angles of a quadrilateral
+
+Sum of angles at point of intersection of diagonals in a quadrilateral
====Concept #3. Types of quadrilaterals====
====Concept #3. Types of quadrilaterals====