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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
探究由平行線和截線所成的角
Explore the invariant lines of matrix {{-2,5},{6,-9}}
What is an Isogonal Conjugate?
Droste effect
Quiz: Finding Average Rate of Change
Discover Resources
CCSS Honors 9.4 Example 1
Parker Watt Concepts of Circles
Circle Construction using three points
stuhan Translation 1
ratio_circumference_by_perimeter_of_polygon
Discover Topics
Prism
Correlation
Vectors 3D (Three-Dimensional)
Similarity Transformation or Similarity
Planes