G.GCO.9 Triangle Angle Theorems

Applet allows the student to powerfully discover the triangle interior and exterior angle sum theorems. Geometric transformations (translation & rotation) are at the heart of this "proof" without words.
Ikusi Lan-orria Ikusi Lan-orria

 

Dan Dale —

 
Baliabide-mota
Lan-orria
Fitxak
180  360  angle  ccss  ccss.8.g.a.5  ccss.hsg.co.c.10  common  common-core  core  exploration  exterior interior sum theorem theorems triangle triangles Erakutsi Gehiago…
Helburu-taldea (adina)
11 – 15
Hizkuntza
English
 
 
Ikustaldiak
3081
Contact author of resource
Lizentzia
CC-BY-SA, GeoGebra Terms of Use
Honetan Oinarriturik
Triangle Angle Theorems (V2)
Honek partekatua: Tim Brzezinski
 
 
© 2026 International GeoGebra Institute