Triangle Names and Angle Sum (Interior and Exterior)

Author:Mr James Bowater, Morton Betts

How to name triangles. The conditions for naming triangles. Proof the sum of interior (inside) angles = 180 deg. Proof the other two angles equal exterior angle.

New Resources

GGB is Awesome!
兩位數的位值
Tetrahedron String Art
Making New Year's resolutions for 2026
bewijs stelling van Pythagoras

Discover Resources

Asymptotes and Rational Function Coefficients
rectangle perimter
sinusfunctie
A1 - King Tot
MyTroubleOne12
Inv3.Copy Angle Template

Discover Topics

Stochastic Process or Random Process
Linear Programming or Linear Optimization
Logarithmic Functions
Difference and Slope
Similarity Transformation or Similarity