Dandelin's theorem in stereo

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* Move points A and B to change section of the cone * Spheres are tangent to the plane and to the cone * Move point P on the conic * When the conic is an ellipse, why is MP+PH constant ?

新しい教材

Quadrant Illustrator 2
希尔伯特曲线
Quadrant Illustrator
Pythagorean Theorem: Extension Exercises
Isosceles Right Triangle

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Enrichment
Tilted Squares
Baby Brother Rabbit
THREE RECTANGLES
Motion of System Particles

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統計
合同
分数
ベクトル (三次元)
微積分