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GeoGebra

Quadrilateral Sum Investigation

Auteur :Rick Cazzato, Dorothy Baker

Use the quadrilateral below to answer the questions provided.

Add angles A, B, C, and D. What is the total sum?

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Click and drag the vertices of the quadrilateral to new locations. Add the new measures of angles A, B, C, and D. What is the new sum?

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Does the total sum of angles shown in the quadrilateral change if you change the size or shape of the figure?

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  • A
  • B
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So, the interior angles of a quadrilateral always add to what value?

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