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ELLIPTIC PARABOLOIDS |
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The surface of the reduced equation
the
sections of which are either parabolic or elliptical. The case of
revolution is obtained by rotating a parabola around its axis of
symmetry and turns out to be the geometric locus of the centres of the
spheres that pass through a point and are tangential to a plane. |
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If a half-filled glass is moved in circles, what surface is formed on the surface of the liquid? |
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Solution | |
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