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118 bytes added ,  06:08, 2 May 2019
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====== [[Angle sum property of a quadrilateral]]======
 
====== [[Angle sum property of a quadrilateral]]======
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Sum of the interior angles of a quadrilateral
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Sum of angles at point of intersection of diagonals in a quadrilateral
    
====Concept #3. Types of quadrilaterals====
 
====Concept #3. Types of quadrilaterals====

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