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  2. CodeHS - Wikipedia

    en.wikipedia.org/wiki/CodeHS

    CodeHS is an interactive online learning platform offering computer science and programming instruction for schools and individual learners. CodeHS is focused on spreading access to and knowledge of computer science by offering online instructional materials supported by remote tutors. In the introductory learning module, students on the site ...

  3. Rectangle - Wikipedia

    en.wikipedia.org/wiki/Rectangle

    Rectangle. In Euclidean plane geometry, a rectangle is a quadrilateral with four right angles. It can also be defined as: an equiangular quadrilateral, since equiangular means that all of its angles are equal (360°/4 = 90°); or a parallelogram containing a right angle. A rectangle with four sides of equal length is a square.

  4. Karnaugh map - Wikipedia

    en.wikipedia.org/wiki/Karnaugh_map

    The brown region is an overlap of the red 2×2 square and the green 4×1 rectangle. The K-map for the inverse of f is shown as gray rectangles, which correspond to maxterms. Once the Karnaugh map has been constructed and the adjacent 1s linked by rectangular and square boxes, the algebraic minterms can be found by examining which variables stay ...

  5. Golden rectangle - Wikipedia

    en.wikipedia.org/wiki/Golden_rectangle

    The respective lengths a, b, and c of the sides of these three polygons satisfy the equation a 2 + b 2 = c 2, so line segments with these lengths form a right triangle (by the converse of the Pythagorean theorem). The ratio of the side length of the hexagon to the decagon is the golden ratio, so this triangle forms half of a golden rectangle. [8]

  6. Quadrilateral - Wikipedia

    en.wikipedia.org/wiki/Quadrilateral

    A quadrilateral is a square if and only if it is both a rhombus and a rectangle (i.e., four equal sides and four equal angles). Oblong: longer than wide, or wider than long (i.e., a rectangle that is not a square). [ 5 ] Kite: two pairs of adjacent sides are of equal length.

  7. Latin rectangle - Wikipedia

    en.wikipedia.org/wiki/Latin_Rectangle

    In combinatorial mathematics, a Latin rectangle is an r × n matrix (where r ≤ n ), using n symbols, usually the numbers 1, 2, 3, ..., n or 0, 1, ..., n − 1 as its entries, with no number occurring more than once in any row or column. [ 1] An n × n Latin rectangle is called a Latin square. Latin rectangles and Latin squares may also be ...

  8. Rectangular function - Wikipedia

    en.wikipedia.org/wiki/Rectangular_function

    The rectangular function (also known as the rectangle function, rect function, Pi function, Heaviside Pi function, [ 1] gate function, unit pulse, or the normalized boxcar function) is defined as [ 2] Alternative definitions of the function define to be 0, [ 3] 1, [ 4][ 5] or undefined. Its periodic version is called a rectangular wave .

  9. Rule of thirds - Wikipedia

    en.wikipedia.org/wiki/Rule_of_thirds

    The tree is at the intersection of two lines, sometimes called a power point[ 1] or a crash point. [ 2] The rule of thirds is a "rule of thumb" for composing visual images such as designs, films, paintings, and photographs. [ 3] The guideline proposes that an image should be imagined as divided into nine equal parts by two equally spaced ...