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the angle in a semi-circle =90
Author:
Conor Martin
GeoGebra
New Resources
Droste effect
Poorly Drawn Parallelograms 2
Poorly Drawn Parallelograms
探究由平行線和截線所成的角
Flip Flop
Discover Resources
Circle Question 1
Simon's Vase: the Net
Geogebra Tutorial: Line Design Complete
Equilateral Triangle
Bad "Histograms"
Discover Topics
Division
Linear Functions
Triangles
Inequalities
Functions