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GC World : Various Problems

Quadrangle¨Quadrangle
Five centroids of triangle etc.
Complex Number
Constant
Curves formed by lines
Graph of Function
Sets of satisfied points
MaxEMin
Alternative of real thing
Is the useless one useless?
Typical examples of GC
Famous Theorems
MovementETransformation
What will occur when something is added?
Can you make it?
What can you see?
Which is which?
Something strange?