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Rotating Equilateral Triangle
Author:
Chip Rollinson
http://www.futilitycloset.com/2016/01/11/straight-and-narrow-4/
GeoGebra
New Resources
Angles of Intersecting Lines
Quiz: Vertical Angles and Linear Pairs
Level Curves
Toroidal Spiral
Circles - Relative Positions
Discover Resources
Symmetry Exercises for Kids
parallel lines and transversals
Complementary Angles
Geometry - Angles at a Point - Opposite Angles are Equal
sine & cosine of 30º and 60º
Discover Topics
Translation
Square
Binomial Distribution
Geometric Mean
Ratios