| If the lateral surface of a cylinder is \[94.2\,c{{m}^{2}}\] and its height is 5 cm, then find radius of its base. [use it \[\pi =3.14\]] [IBPS (SO) 2014] |
A) 5 cm
B) 7 cm
C) 3 cm
D) 9 cm
E) 4 cm
Correct Answer: C
Solution :
| Lateral surface area of cylinder \[94.2\,c{{m}^{2}}\] |
| Height = 5 cm, Radius = ? |
| We know lateral surface area of cylinder \[=2\pi rh\] |
| \[94.2=2\times 3.14\times r\times 5\] |
| \[\Rightarrow \] \[94.2=31.4\times r\]\[\Rightarrow \]\[r=3\,cm\] |
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