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GeoGebra
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Perpetual calendar
Author:
Jean David
GeoGebra
1) Find the principle of the calendar. 2) Explain the red month for leap years.
New Resources
Triangle with 3 Right Angles
Reflection Across 2 Parallel Lines
Reflection = 180° Rotation about a Line
Shells
Untitled
Discover Resources
Venn Diagram
Pentagon
JavaScript API Example: registerAddListener()
Muntered Diamond
Discover Topics
Perimeter
Rational Numbers
Line Segment
Set Theory
Matrices