Triangle interior angles: AR version 🙂 GeoGebra

@geogebra Yep, in the old days, we would cut out a triangle, then tear off the 3 corners and piece them together to make a straight line. Both are concrete and visual ways to help kids derive and remember the sum of the angles!

@geogebra I still do this with my Ss. Hands on discovery learning via paper folding, scissors, compass, & straightedge will never go out of style & will never leave my classroom. 🙂

@geogebra This triangle graphic is adorable. I've been known to roll a triangle along a line to show the 180, but never thought to fold it in like this. ♥️

@geogebra This is beautiful!

@geogebra Thank you!

@geogebra Very cool ...thank you

@geogebra It’s amazing 🤩

@geogebra T/Y! :)

@geogebra Now I learning how to use GeoGebra, and I like it. How to make math simple and fun for students and teachers.

@geogebra I feel like there is an area proof mixed in here too...