Internal angle sum of triangles

Author:mrsK

- Drag the vertices A, B, C to create different types of triangles. - Use the sliders to create copies of the same triangle and prove that the internal angles always add up to 180 degrees.

New Resources

Noisy loop
Taylor Series for 1/(1 - x)
Multiplying 4-Digit by 3-Digit Numbers Using an Area Model
Multiplying 4-Digit by 4-Digit Numbers Using an Area Model
A Happy Polar Leaf

Discover Resources

Euler's Method
(a+b)^3
הזוית בין המישורים
Pythagoras sats

Discover Topics

Incircle or Inscribed Circle
Fractal Geometry
Trigonometric Functions
Reflection
Surface