Conversion factors in red are exact

(1) Area, in acres, of a field that is 142.3 feet by 78.4 feet.

142.3 >> 4 sf

78.4 >> 3 sf

        

 
(2) Area in square meters covered by a rotating agricultural sprinkler that is 425 feet long.

425 >> 3 sf

 

              

 
(3) Volume of material in cubic yards removed from a 112.5 foot long rectangular trench that is 38 inches wide by 6.25 feet deep.

112.5 >> 4 sf
38 >> 2 sf
6.25 >> 3 sf

              


(4) Convert 18°12’47” to radians.

Step one - convert deg and min to seconds

          

Step two - add together the the angle parts to determine number of sf in the seconds

64,800"   exact
+720"   exact
+47"   2 sf
65,567"   5 sf
 
Step three - convert the angle in seconds to radians

              


(5) Gravel for a road sub-base will be spread to a thickness of 6.0 inches 13.5 feet on both sides of centerline. What sub-base length in feet will covered by the gravel from a truck with a 12.4 cubic yard load?

6.0 >> 2sf
13.5 >> 3sf
12.4 >> 3sf

 

(6) A distance is measured in three segments by different surveyors. Their individual measurements are 3.45 meters, 7.83 feet, and 95.6 inches. What is the total distance in feet?
Step one - Convert all to feet carrying one additional sf.

Step two - add the segments using sf addition rule

 
Step three - drop extra sf carried for intermediate comps
distance = 27.1 ft   << 3 sf

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