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* Geogebra files : ‘[https://ggbm.at/dseaa3pq Sum of the interior angles of a quadrilateral.ggb]’
 
* Geogebra files : ‘[https://ggbm.at/dseaa3pq Sum of the interior angles of a quadrilateral.ggb]’
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==={{Geogebra|dseaa3pq}}Process (How to do the activity)===
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==={{Geogebra|dseaa3pq}}===
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===Process (How to do the activity)===
 
* In the geogebra sketch for the quadrilateral measure the sides and angles at the vertices
 
* In the geogebra sketch for the quadrilateral measure the sides and angles at the vertices
 
* Calculate the sum of these angles of the quadrilateral? Note your observations
 
* Calculate the sum of these angles of the quadrilateral? Note your observations

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