POLYGONS

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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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