A) \[5544\,c{{m}^{2}}\]
B) \[2342\,c{{m}^{2}}\]
C) \[3432\,c{{m}^{2}}\]
D) \[1152\,c{{m}^{2}}\]
Correct Answer: A
Solution :
We have, r = 28 cm and A =21 cm Slant height \[(l)=\sqrt{{{r}^{2}}+{{h}^{2}}}=\sqrt{{{(28)}^{2}}+{{(21)}^{2}}}\] \[=\sqrt{1225}=35\,cm\] \[\therefore \] Total surface area \[=\pi r(l+r)=\frac{22}{7}\times 28\times (35+28)\] \[=\frac{22}{7}\times 28\times 63=5544\,\,\text{c}{{\text{m}}^{\text{2}}}\]
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