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  2. NCERT textbook controversies - Wikipedia

    en.wikipedia.org/wiki/NCERT_textbook_controversies

    The poem Sabse Khatarnak by the Hindi poet Pash was included in the NCERT textbook for 11th standard Hindi students in 2006. In 2017, the BJP government affiliated RSS tried to remove it but failed. [28] [29] The NCERT made two controversial changes to the class XII political science textbook ‘Politics in India Since Independence’ in 2017.

  3. National Council of Educational Research and Training

    en.wikipedia.org/wiki/National_Council_of...

    Those who wish to adopt the textbooks are required to send a request to NCERT, upon which soft copies of the books are received. The material is press-ready and may be printed by paying a 5% royalty, and by acknowledging NCERT. [11] The textbooks are in color-print and are among the least expensive books in Indian book stores. [11]

  4. Parabola - Wikipedia

    en.wikipedia.org/wiki/Parabola

    The curve of the chains of a suspension bridge is always an intermediate curve between a parabola and a catenary, but in practice the curve is generally nearer to a parabola due to the weight of the load (i.e. the road) being much larger than the cables themselves, and in calculations the second-degree polynomial formula of a parabola is used.

  5. Conic section - Wikipedia

    en.wikipedia.org/wiki/Conic_section

    A conic is the curve obtained as the intersection of a plane, called the cutting plane, with the surface of a double cone (a cone with two nappes).It is usually assumed that the cone is a right circular cone for the purpose of easy description, but this is not required; any double cone with some circular cross-section will suffice.

  6. Parabolic antenna - Wikipedia

    en.wikipedia.org/wiki/Parabolic_antenna

    A parabolic antenna is an antenna that uses a parabolic reflector, a curved surface with the cross-sectional shape of a parabola, to direct the radio waves. The most common form is shaped like a dish and is popularly called a dish antenna or parabolic dish. The main advantage of a parabolic antenna is that it has high directivity.

  7. Paraboloid - Wikipedia

    en.wikipedia.org/wiki/Paraboloid

    In this position, the hyperbolic paraboloid opens downward along the x-axis and upward along the y-axis (that is, the parabola in the plane x = 0 opens upward and the parabola in the plane y = 0 opens downward). Any paraboloid (elliptic or hyperbolic) is a translation surface, as it can be generated by a moving parabola directed by a second ...

  8. Hyperbola - Wikipedia

    en.wikipedia.org/wiki/Hyperbola

    Inscribed angle theorem for hyperbolas [10] [11] — For four points = (,), =,,,, ,, (see diagram) the following statement is true: The four points are on a hyperbola with equation y = a x − b + c {\displaystyle y={\tfrac {a}{x-b}}+c} if and only if the angles at P 3 {\displaystyle P_{3}} and P 4 {\displaystyle P_{4}} are equal in the sense ...

  9. Parable - Wikipedia

    en.wikipedia.org/wiki/Parable

    [11] The defining characteristic of the parable is the presence of a subtext suggesting how a person should behave or what he should believe. Aside from providing guidance and suggestions for proper conduct in one's life, parables frequently use metaphorical language which allows people to more easily discuss difficult or complex ideas.