The circumference of the base of a right circular cone is 44 cm and its height is 24 cm. The curved surface area (in cm2) of the cone is:
A. 528
B. 572
C. 550
D. 440
Answer: Option C
Solution (By Examveda Team)
$$\eqalign{ & 2\pi r = 44 \cr & 2 \times \frac{{22}}{7} \times r = 44 \cr & r = 7 \cr & {\text{Curved surface area}} = \pi rl \cr & = \frac{{22}}{7} \times 7 \times 25 \cr & = 550{\text{ c}}{{\text{m}}^2} \cr} $$
This Question Belongs to Arithmetic Ability >> Mensuration 3D
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B. 4.224 cm3
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D. 42.24 cm3
A sphere and a hemisphere have the same volume. The ratio of their curved surface area is:
A. $${2^{\frac{3}{2}}}:1$$
B. $${2^{\frac{2}{3}}}:1$$
C. $${4^{\frac{2}{3}}}:1$$
D. $${2^{\frac{1}{3}}}:1$$
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