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square


  1. A quadrilateral with four equal sides that meet at right angles.

  2. To square something is to multiply it by itself. To take the square root is the reverse process. A square number is the square of a whole number. A well known formula for the difference of squares is a2 - b2 = (a + b)(a - b). This formula enables some otherwise difficult calculations to be done easily in the head. For example, 43 × 37 = (40 + 3)(40 - 3) = 402 - 32 = 1600 - 9 = 1591.

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