A) 10 cm
B) 11 cm
C) 12 cm
D) 13 cm
Correct Answer: C
Solution :
Let radius = 4x cm |
Slant height = 7x cm |
Curved surface area = 792 (Given) |
\[\therefore \]\[\frac{22}{7}\times 4x\times 7x=792\] |
\[\Rightarrow \] \[88{{x}^{2}}=792\]\[\Rightarrow \]\[{{x}^{2}}=\frac{792}{88}=9\]\[\Rightarrow \]\[x=3\] |
\[\therefore \]Radius of cone \[=4x=4\times 3=12\,\,\text{cm}\] |
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