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of  linear  measure  is  the  meter.  The  length  of  a meter was originally designed to equal (and does equal very nearly) one ten-millionth part of the distance,  measured  along  a  meridian,  between  the earth’s  equator  and  one  of  the  poles.  A  meter equals  slightly  more  than  1.09  yd. The big advantage of the metric system is the fact that it is a decimal system throughout; that is,  the  fact  that  the  basic  unit  can  be  both subdivided  into  smaller  units  decimally  and converted  to  larger  units  decimally  by  simply moving   the   decimal   point   in   the   appropriate direction. Names of units smaller than the meter are   indicated   by   the   Latin   prefixes   deci- (one-tenth),  centi-  (one-hundredth),  mini-  (one- thousandth),   and   micro-   (one-millionth),   as follows: Names   of   units   larger   than   the   meter are  indicated  by  the  Greek  prefixes  deca-  (ten), hecto-  (one  hundred),  kilo-  (one  thousand),  myria- (ten  thousand),  and  mega-  (one  million),  as follows: UNITS  OF  AREA  MEASUREMENT In the English and metric system, area is most frequently  designated  in  units  that  consist  of squares  of  linear  units,  as  square  inches,  feet, yards, or miles; or square centimeters, meters, or kilometers. In the English system, the land-area measurements  most  commonly  used  are  the square  foot  and  the  acre.  Formerly  the  square  rod (1   rod   =   16.5   ft)   and   the   square   Gunter’s chain ( 1 Gunters’s chain = 66 ft) were used. One of the area measurements, with its equivalents, is  as  follows: An   equilateral   rectangular   (square)   acre measures 208.71 ft on a side. There are 640 acres in a square mile. Other area equivalents that may be of value to  you  are  as  follows: Actually,  more  attention  should  be  given  to linear   equivalents.    If   you   know   the   linear conversion factor from one unit to the other, you can  always  compute  for  any  equivalent  area  or even  volume.  Just  remember,  area  is  expressed  in square  units  and  volume  is  expressed  in  cubic units. Example: Find the area of a rectangle 2 ft by 3 ft in square inches. Area = 2 ft x 3 ft = (2 x12)(3 x 12) = 864 sq in. UNIT  OF  VOLUME  MEASUREMENT From your study of mathematics, you learned that volume is the measure of the amount of space that  matter  occupies.  It  is  expressed  in  certain cubic   units,   depending   upon   the   linear measurements  or  dimensions  of  the  object. As an EA, you will find that your interest in unit  volume  of  measurements  will  be  from  the standpoint of earthwork, construction materials, material testing, rainfall runoff, and capacities of structures, such as, for example, a reservoir. The accuracy of your computations will depend upon your knowledge of the correct conversion factors 1-28

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