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Archimedes - triangle & parabolic segment
Author:
Judah L Schwartz
Archimedes proved that the area of a parabolic segment is 4/3 the area of a triangle with the same base and altitude.
GeoGebra
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Poorly Drawn Parallelograms 3
Droste effect
探究由平行線和截線所成的角
Explore the invariant lines of matrix {{-2,5},{6,-9}}
Poorly Drawn Parallelograms
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