A) \[\text{32}0\text{ c}{{\text{m}}^{\text{2}}}\]
B) \[\text{33}0\text{ c}{{\text{m}}^{\text{2}}}\]
C) \[\text{352 c}{{\text{m}}^{\text{2}}}\]
D) \[\text{350 c}{{\text{m}}^{\text{2}}}\]
Correct Answer: B
Solution :
| [b] Let R and r be the outer and inner radius respectively. |
| Area of the ring |
| \[=\pi ({{R}^{2}}-{{r}^{2}})=\pi (R+r)\,(R-r)\] |
| \[=\left\{ \frac{22}{7}\times (19+16)\,(19-16) \right\}\] |
| \[=\left( \frac{22}{7}\times 35\times 3 \right)=330\,c{{m}^{2}}\] |
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