Google Classroom
GeoGebra
GeoGebra Classroom
Sign in
Search
Google Classroom
GeoGebra
GeoGebra Classroom
GeoGebra
Home
Resources
Profile
Classroom
App Downloads
Folding a Triangle
Author:
Andrew Stacey
Topic:
Triangles
This animation shows the "folding a triangle" method of proving both that the angles add up to 180 and the area of the triangle is "half base times height". The vertices of the triangle can be moved.
GeoGebra
New Resources
Poorly Drawn Parallelograms 3
What is an Isogonal Conjugate?
Taylor Polynomial
Average Rate of Change: Graph a Function (2)
Construct a Conic
Discover Resources
Problem 159
Olympic Participation Rate (1-prop z)
Ordering Rational and Irrational Numbers
Tri pond
linear polynomial
Discover Topics
Division
Parabola
Inequalities
Root
Boxplot