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In this applet, students are led to discover, without words or angle measures, that a 30-60-90 triangle is half an equilateral triangle. They are also led to discover that the length of the hypotenuse of a 30-60-90 triangle = double the length of its shorter leg, and are prompted to solve for the longer leg in simple radical form.

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Special Triangle (III): Birth & Properties

geogebra.org

Find out about all the details in the Introductory book (http://www.geogebra.org/book/intro-en.pdf)

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'Tangram' Puzzle 'Cat'

geogebra.org

The Turtle is back!!!

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Radians in Unit Circle

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Radians in Unit Circle

geogebra.org

The figure below is an Arbelos, which means shoemaker's knife in Greek. The grey circle is the Inscribed Circle of the Arbelos. Drag the blue points. The red circles suggest a way to construct the inscribed circle. How should the inscribed circle be constructed?

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The Arbelos 4: The Inscribed Circle

geogebra.org

GEOGEBRA FOR ALL: Solids of revolution (3D with Geogebra4.25 in html5)

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Animatioon 3D in Desmos (spinning top)

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Geogebra lighthouse in the storm

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http://dmentrard.free.fr/GEOGEBRA/Maths/export4.25/Algebresomme.html

GEOGEBRA FOR ALL: Methods for algebraic sum (Geoogebra4.25 in html5)

dmentrard.blogspot.it

Illusioni ottiche. Percezione del colore. Happy New Year!

Illusione ottica

geogebra.org