A) 2.2 km
B) 2.4 km
C) 3 km
D) 3.11 km
Correct Answer: B
Solution :
\[\therefore \] \[r=2.5\,km\] and area of base \[=1.54\,k{{m}^{2}}\] \[\therefore \] \[\pi {{r}^{2}}=1.54\] \[\Rightarrow \] \[{{r}^{2}}=\frac{1.54\times 7}{22}=0.49\] \[\Rightarrow \] \[r=0.7\,km\] \[\therefore \] \[h=\sqrt{{{l}^{2}}-{{r}^{2}}}\] \[=\sqrt{{{(2.5)}^{2}}-{{(0.7)}^{2}}}\] \[=\sqrt{6.25-0.49}=\sqrt{5.76}=2.4\,km\]
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