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2. Quizlet - Wikipedia

   en.wikipedia.org/wiki/Quizlet

   Quizlet's primary products include digital flash cards, matching games, practice electronic assessments, and live quizzes. In 2017, 1 in 2 high school students used Quizlet. [ 4 ] As of December 2021, Quizlet has over 500 million user-generated flashcard sets and more than 60 million active users.

3. Four-dimensional space - Wikipedia

   en.wikipedia.org/wiki/Four-dimensional_space

   The 4-volume or hypervolume in 4D can be calculated in closed form for simple geometrical figures, such as the tesseract (s 4, for side length s) and the 4-ball (/ for radius r). Reasoning by analogy from familiar lower dimensions can be an excellent intuitive guide, but care must be exercised not to accept results that are not more rigorously ...

4. Rotations in 4-dimensional Euclidean space - Wikipedia

   en.wikipedia.org/wiki/Rotations_in_4-dimensional...

   SO(4) is commonly identified with the group of orientation-preserving isometric linear mappings of a 4D vector space with inner product over the real numbers onto itself. With respect to an orthonormal basis in such a space SO(4) is represented as the group of real 4th-order orthogonal matrices with determinant +1. [3]

5. 4-polytope - Wikipedia

   en.wikipedia.org/wiki/4-polytope

   In geometry, a 4-polytope (sometimes also called a polychoron, [1] polycell, or polyhedroid) is a four-dimensional polytope. [ 2 ] [ 3 ] It is a connected and closed figure, composed of lower-dimensional polytopal elements: vertices , edges , faces ( polygons ), and cells ( polyhedra ).

6. Area of a circle - Wikipedia

   en.wikipedia.org/wiki/Area_of_a_circle

   Between the square and the circle are four segments. If the total area of those gaps, G 4, is greater than E, split each arc in half. This makes the inscribed square into an inscribed octagon, and produces eight segments with a smaller total gap, G 8. Continue splitting until the total gap area, G n, is less than E.

7. Tesseract - Wikipedia

   en.wikipedia.org/wiki/Tesseract

   The regular complex polytope 4 {4} 2, , in has a real representation as a tesseract or 4-4 duoprism in 4-dimensional space. 4 {4} 2 has 16 vertices, and 8 4-edges. Its symmetry is 4 [4] 2, order 32. It also has a lower symmetry construction, , or 4 {}× 4 {}, with symmetry 4 [2] 4, order 16. This is the symmetry if the red and blue 4-edges are ...