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→Sum of the interior angles of a quadrilateral
====== [[Angle sum property of a quadrilateral]]======
====== [[Angle sum property of a quadrilateral]]======
====== Sum of the interior angles of a quadrilateral ======
====== [[Sum of the interior angles of a quadrilateral]] ======
====== Sum of angles at point of intersection of diagonals in a quadrilateral ======
====== [[Sum of angles at point of intersection of diagonals in a quadrilateral]] ======
====== Area of a quadrilateral ======
====== [[Area of a quadrilateral]] ======
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{| style="height:10px; float:right; align:center;"
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|<div style="width:150px;border:none; border-radius:10px;box-shadow: 5px 5px 5px #888888; background:#f5f5f5; vertical-align:top; text-align:center; padding:5px;">