Six Sigma is a set of techniques and tools for process improvement. It was introduced by engineer Bill Smith while working at Motorola in 1986. Jack Welch made it central to his business strategy at General Electric in 1995. Today, it is used in many industrial sectors.
One acre equals 0.0015625 square miles, 4,840 square yards, 43,560 square feet or about 4,047 square metres (0.405 hectares) (see below). While all modern variants of the acre contain 4,840 square yards, there are alternative definitions of a yard, so the exact size of an acre depends on which yard it is based.
Unlike the square foot, square yard, square meter, etc., the acre has no linear dimensions. It is purely a unit of area, = 43,560 square feet. The two sides of a 1-acre rectangular lot can be any lengths as long as multiplying one by the other gives 43,560 (if the sides were measured in feet). if a 1-acre lot is a square, its sides will be 208.7103256 feet long (208.7103256 Ã 208.7103256 = 43,560). Imagine a sidewalk 5 feet wide. If it were (43560 Ã· 5 = ) 8712 feet long it would take up an acre, a long skinny acre.