Elliptical training machine

主題：幾何

Yesterday I was at the gym, and asked myself: does the elliptical training machine really trace an ellipse? The answer is: not exactly, and here's a visual proof.

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ΚΥΚΛΟΣ (Κ, ρ)
Trig1
tangent normal
Common tangent to two circles
Ellipse tangent to kite
Not good

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垂心
三角形
算術運算
體積
角柱

Elliptical training machine

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