sum of interior angles of a quadrilateral is 360 degrees

Argomento:Angoli

On the screen, we see a quadrilateral ABCD in blue color. Observe how the shape and angles of this quadrilateral ABCD change as we move the points A, B, C and D.

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UCSS Math I 5.3.1 Example 3
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ΣΤΕΡΕΑ ΕΚ ΠΕΡΙΣΤΡΟΦΗΣ - ΠΑΡΑΔΕΙΓΜΑΤΑ
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