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  2. Viviani's curve - Wikipedia

    en.wikipedia.org/wiki/Viviani's_curve

    The orthographic projection of Viviani's curve onto a plane perpendicular to the line through the crossing point and the sphere center is the lemniscate of Gerono, while the stereographic projection is a hyperbola or the lemniscate of Bernoulli, depending on which point on the same line is used to project. [3]

  3. Plücker coordinates - Wikipedia

    en.wikipedia.org/wiki/Plücker_coordinates

    Alternatively, a line can be described as the intersection of two planes. Let L be a line contained in distinct planes a and b with homogeneous coefficients (a 0 : a 1 : a 2 : a 3) and (b 0 : b 1 : b 2 : b 3), respectively. (The first plane equation is =, for example.)

  4. Stereographic projection - Wikipedia

    en.wikipedia.org/wiki/Stereographic_projection

    Further associated with each plane is a unique line, called the plane's pole, that passes through the origin and is perpendicular to the plane. This line can be plotted as a point on the disk just as any line through the origin can. So the stereographic projection also lets us visualize planes as points in the disk.

  5. Normal (geometry) - Wikipedia

    en.wikipedia.org/wiki/Normal_(geometry)

    In geometry, a normal is an object (e.g. a line, ray, or vector) that is perpendicular to a given object. For example, the normal line to a plane curve at a given point is the line perpendicular to the tangent line to the curve at the point. A normal vector of length one is called a unit normal vector.

  6. Euclidean plane - Wikipedia

    en.wikipedia.org/wiki/Euclidean_plane

    In graph theory, a planar graph is a graph that can be embedded in the plane, i.e., it can be drawn on the plane in such a way that its edges intersect only at their endpoints. In other words, it can be drawn in such a way that no edges cross each other. [9] Such a drawing is called a plane graph or planar embedding of the graph.

  7. Line–plane intersection - Wikipedia

    en.wikipedia.org/wiki/Lineplane_intersection

    In analytic geometry, the intersection of a line and a plane in three-dimensional space can be the empty set, a point, or a line. It is the entire line if that line is embedded in the plane, and is the empty set if the line is parallel to the plane but outside it. Otherwise, the line cuts through the plane at a single point.

  8. China blames US policy on Taiwan for defence leaders not meeting

    www.aol.com/news/china-blames-us-policy-taiwan...

    China's defence ministry blamed the United States' stance on Taiwan for its minister not meeting his U.S. counterpart during a gathering this week in Laos. Defence Minister Dong Jun turned down ...

  9. Screw axis - Wikipedia

    en.wikipedia.org/wiki/Screw_axis

    A screw axis (helical axis or twist axis) is a line that is simultaneously the axis of rotation and the line along which translation of a body occurs. Chasles' theorem shows that each Euclidean displacement in three-dimensional space has a screw axis, and the displacement can be decomposed into a rotation about and a slide along this screw axis.

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