## square- A quadrilateral with four equal sides that meet at right angles.
- 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*a*^{2}-*b*^{2}= (*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) = 40^{2}- 3^{2}= 1600 - 9 = 1591.
## Related category• POLYGONS | |||||

Home • About • Copyright © The Worlds of David Darling • Encyclopedia of Alternative Energy • Contact |