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练习（点，斜率，直线）
Author:
朱亮
GeoGebra
New Resources
Random Polar Curve (1)
Circumference of a unit circle
Tracing an Ellipse Using Two Circles
bewijs stelling van Pythagoras
רישום חופשי
Discover Resources
dot pattern 1
forum
Polygon
converging secants
Suffocation rotation tessellation investigation. (SRTI)
Discover Topics
Coordinates
Conic Sections
Perimeter
Percentages
Linear Functions