Triangle interior angles. GeoGebra #MTBoS #ITeachMath For a thin slice activity where Ss explore & discover polygon interior and exterior angle sum theorems: Peter Liljedahl Building Thinking Classrooms #MTBoS #ITeachMath

@geogebra @pgliljedahl @BTCthinks What is that device you're using?

@geogebra @pgliljedahl @BTCthinks That was recorded on my iPad while in @geogebra 3D calculator app. (Not implying augmented reality is a necessity for learning & exploring here 🙂). Yet this can be done on an iPhone & Android as well.

@geogebra @pgliljedahl @BTCthinks Oh, this one's pretty.

@geogebra @pgliljedahl @BTCthinks Thank you! 🙂

@geogebra @pgliljedahl @BTCthinks 😯👍👍👈

@geogebra @pgliljedahl @BTCthinks @JTaggart25 🤯

That each internal angle's relationship to the total triangle is preserved by each transforming 180° from their original positions in 2 dimensions to add up to 180° in one dimension via a total of 540° of movement. This could be used to argue/prove that the total information of the polygon is retained in any part of the polygon.

@geogebra @pgliljedahl @BTCthinks Is there an easy way to find the dimensions of the resulting rectangle?

@geogebra @pgliljedahl @BTCthinks Damn, so what is the volume that is round or flat🤣