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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 m², what is the radius of the field ? (Take π = 22/7 )
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- 130 m
- 135 m
- 140 m
- 145 m
- 130 m
Correct Option: C
Using Rule 14, Area of the tank = 180 × 120 = 21600 m².
Total area of the circular plot = 40000 + 21600 = 61600 m².
∴ πr² = 61600
| ⇒ r² = | |
| 22 |
= 2800 × 7
⇒ r = √2800 × 7
⇒ r = 2 × 7 × 10 = 140m
