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  2. Intersection (geometry) - Wikipedia

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

    Intersection problems between a line and a conic section (circle, ellipse, parabola, etc.) or a quadric (sphere, cylinder, hyperboloid, etc.) lead to quadratic equations that can be easily solved. Intersections between quadrics lead to quartic equations that can be solved algebraically.

  3. Intersectionality - Wikipedia

    en.wikipedia.org/wiki/Intersectionality

    These intersecting and overlapping social identities may be both empowering and oppressing. [2] [3] Intersectionality arose in reaction to both white feminism and the then male-dominated black liberation movement, citing the "interlocking oppressions" of racism, sexism and heteronormativity.

  4. Intersection - Wikipedia

    en.wikipedia.org/wiki/Intersection

    The intersection (red) of two disks (white and red with black boundaries). The circle (black) intersects the line (purple) in two points (red). The disk (yellow) intersects the line in the line segment between the two red points. The intersection of D and E is shown in grayish purple. The intersection of A with any of B, C, D, or E is the empty ...

  5. Intersection (set theory) - Wikipedia

    en.wikipedia.org/wiki/Intersection_(set_theory)

    So the intersection of the empty family should be the universal set (the identity element for the operation of intersection), [4] but in standard set theory, the universal set does not exist. However, when restricted to the context of subsets of a given fixed set X {\displaystyle X} , the notion of the intersection of an empty collection of ...

  6. Tangent lines to circles - Wikipedia

    en.wikipedia.org/wiki/Tangent_lines_to_circles

    Draw any three different lines through the given point P that intersect the circle twice. Let A 1, A 2, B 1, B 2, C 1, C 2 be the six intersection points, with the same letter corresponding to the same line and the index 1 corresponding to the point closer to P. Let D be the point where the lines A 1 B 2 and A 2 B 1 intersect, Similarly E for ...

  7. Polygon - Wikipedia

    en.wikipedia.org/wiki/Polygon

    Some polygons of different kinds: open (excluding its boundary), boundary only (excluding interior), closed (including both boundary and interior), and self-intersecting. In geometry, a polygon (/ ˈ p ɒ l ɪ ɡ ɒ n /) is a plane figure made up of line segments connected to form a closed polygonal chain.

  8. DE-9IM - Wikipedia

    en.wikipedia.org/wiki/DE-9IM

    The Dimensionally Extended 9-Intersection Model (DE-9IM) is a topological model and a standard used to describe the spatial relations of two regions (two geometries in two-dimensions, R 2), in geometry, point-set topology, geospatial topology, and fields related to computer spatial analysis.

  9. Line–line intersection - Wikipedia

    en.wikipedia.org/wiki/Line–line_intersection

    Two intersecting lines. In Euclidean geometry, the intersection of a line and a line can be the empty set, a point, or another line.Distinguishing these cases and finding the intersection have uses, for example, in computer graphics, motion planning, and collision detection.