There is a rectangular tank of length 180 m and breadth 120

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RRB TA Exam (Chennai) 2008 click here to view all questions

There is a rectangular tank of length 180 m and breadth 120 m in a circular field. If the area of the land portion of the field is 40000 m^2, what is the radius of the field? (take Π = 22/7 )

A130 m

B135 m

C140 m

D145 m

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Answer is : Option C Explanation : Total area of the field  =$[(180 x 120) + 40000] \text{ }m^2$ = $(21600 + 40000) \text{ }m^2 = 61600 \text{ }m^2$ $\therefore \pi R^2 = 61600$ ⇔ $R^2$ =$\Big(61600×\frac{7}{22}\Big)$ = 400 x 7 x 7) m  R = 20 x 7 =  140 m.   test@gmail ? answered Oct 17 '2017 at 19:42 All Comments

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