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GGF EN KGV
Author:
Nolan
Discover Resources
Equal chords subtend equal angles at the center.
圓方程：測驗 Quiz on Equation of Circle
IVT Dynamic Illustrator
ext. angles= 360
GeoGebra Global Gathering 2017
New Resources
Sebastian_Rectangle
hw problem
Vivek_Circles and Rectangles
Inverse of Functions
Invariants DEMO
