Aptitude  Volume and Surface Area
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 Volume and Surface Area  Formulas
 Volume and Surface Area  General Questions
 Volume and Surface Area  Data Sufficiency 1
 Volume and Surface Area  Data Sufficiency 2
Clearly, we have r = 3 cm and h = 4 cm.
Volume =  1  r^{2}h =  1  x x 3^{2} x 4  cm^{3}  = 12 cm^{3}.  
3  3 
Video Explanation: https://youtu.be/Njsid2mVwUY
1 hectare = 10,000 m^{2}
So, Area = (1.5 x 10000) m^{2} = 15000 m^{2}.
Depth =  5  m  =  1  m. 
100  20 
Volume = (Area x Depth) =  15000 x  1  m^{3}  = 750 m^{3}.  
20 
Video Explanation: https://youtu.be/dDbVuBzYop8
2(15 + 12) x h = 2(15 x 12)
h =  180  m =  20  m. 
27  3 
Volume =  15 x 12 x  20  m^{3}  = 1200 m^{3}.  
3 
Video Explanation: https://youtu.be/V8EQ1YIaH74
Let the length of the wire be h.
Radius =  1  mm  =  1  cm.  Then, 
2  20 
22  x  1  x  1  x h = 66.  
7  20  20 
h =  66 x 20 x 20 x 7  = 8400 cm = 84 m.  
22 
External radius = 4 cm,
Internal radius = 3 cm.
Volume of iron 




= 462 cm^{3}. 
Weight of iron = (462 x 8) gm = 3696 gm = 3.696 kg.