The ellipse as a locus.

作者：ltgrau

主題：橢圓

The ellipse is the locus of all points the sum of whose distances from two fixed points is a constant. We visualize this definition and check the sum of distances when a point runs the ellipse.

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MSM3
Net area
Cosec curve
Angle in a semicircle
Vectors in 2D

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二次函數
整數
Linear Equations
相似三角形
圓

The ellipse as a locus.

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