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Aretino
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Copy of Hyperbolic Geometry in the Poincaré Disk
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Aretino
Quadric from nine points
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Step forward, turn left, step forward, turn left … on a sphere.
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Aretino
Construction of tangents to an ellipse from an external point P
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Aretino
Roundest ellipse, with given tangents at two points
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Aretino
Shadow path
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Hula hoop
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A chain of three segments
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Triangles
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An oval
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How to build a tetartoid.
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Aretino
