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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What Do You See? (2)
Pythagorean Theorem: Quick Illustrator
Congruent Figures
What Do You See?
Isosceles Right Triangle

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Segments of Circles 2
annemarie_pettit_circumcenter
Square spiral
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