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  2. Square (algebra) - Wikipedia

    en.wikipedia.org/wiki/Square_(algebra)

    The square of an integer may also be called a square number or a perfect square. In algebra, the operation of squaring is often generalized to polynomials, other expressions, or values in systems of mathematical values other than the numbers. For instance, the square of the linear polynomial x + 1 is the quadratic polynomial (x + 1) 2 = x 2 ...

  3. Square number - Wikipedia

    en.wikipedia.org/wiki/Square_number

    Square number 16 as sum of gnomons. In mathematics, a square number or perfect square is an integer that is the square of an integer; [1] in other words, it is the product of some integer with itself. For example, 9 is a square number, since it equals 3 2 and can be written as 3 × 3.

  4. 27 (number) - Wikipedia

    en.wikipedia.org/wiki/27_(number)

    The Moon revolves around the Earth the same direction as Earth spins but 27 (27.3) times slower. 27km is the circumference of the LHC located at CERN in Meyrin Switzerland; The atomic number of cobalt. Dark matter is thought to make up 27% of the universe. [12] 27 is the number of bones in the human hand. [13]

  5. Difference of two squares - Wikipedia

    en.wikipedia.org/wiki/Difference_of_two_squares

    Another geometric proof proceeds as follows: We start with the figure shown in the first diagram below, a large square with a smaller square removed from it. The side of the entire square is a, and the side of the small removed square is b. The area of the shaded region is . A cut is made, splitting the region into two rectangular pieces, as ...

  6. Squared triangular number - Wikipedia

    en.wikipedia.org/wiki/Squared_triangular_number

    A square whose side length is a triangular number can be partitioned into squares and half-squares whose areas add to cubes. From Gulley (2010).The n th coloured region shows n squares of dimension n by n (the rectangle is 1 evenly divided square), hence the area of the n th region is n times n × n.

  7. Sum of squares - Wikipedia

    en.wikipedia.org/wiki/Sum_of_squares

    The Pythagorean theorem says that the square on the hypotenuse of a right triangle is equal in area to the sum of the squares on the legs. The sum of squares is not factorable. The squared Euclidean distance between two points, equal to the sum of squares of the differences between their coordinates

  8. Cube (algebra) - Wikipedia

    en.wikipedia.org/wiki/Cube_(algebra)

    27 13 3 = 2197 23 3 = 12,167 33 3 = 35,937 43 3 = 79,507 53 3 = 148,877 4 3 = 64 14 3 = 2744 ... Visual demonstration that the square of a triangular number equals a ...

  9. Square - Wikipedia

    en.wikipedia.org/wiki/Square

    The central angle of a square is equal to 90° (360°/4). The external angle of a square is equal to 90°. The diagonals of a square are equal and bisect each other, meeting at 90°. The diagonal of a square bisects its internal angle, forming adjacent angles of 45°. All four sides of a square are equal. Opposite sides of a square are parallel.