the area of a circular field is 13 86 hectares cost..., Area, General Mathematics

Question:The area of a circular field is 13.86 hectares. The cost of fencing it at the rate of 40 paise per metre is :

A `Rs. 554.40` 
B `Rs. 528` 
C `Rs. 396` 
D `Rs. 648`

/98

+ AnswerB

+ ExplanationArea` = (13.86 xx 100000) sq.m`

  `= 138600 m^2.`

`π R^2 = 138600 or R^2`

 `= (138600 xx 7/22) => R`

`= 210 m.`

Circumference` = 2 π R = (2 xx 22/7 xx 210) m`

                 `= 1320 m.`

cost of fencing` = Rs. (1320 xx 40/100)`

      `= Rs. 528`

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