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เกรียงศักดิ์
GeoGebra
New Resources
Pairs of Numbers Given a Sum
Open Middle: Basic Statistics Exercise (1)
A2_9.04 Margin of error
Polar transformation
Getting to Know GeoGebra
Discover Resources
Nine-Point Circle
Derivative of cos(x)
Non-obvious Geometrical Properties of a Triangle
Similar Triangle and Slope
Total Internal Reflection
Discover Topics
Surface
Median Value
Special Points
Ratios
Coordinates