Question

The volume of cylindrical pillar is 1520 cm3 and its CSA is 440 cm3.find the height of pillar.

Answer 1

Hey



Volume = 1520 cm³


So ,


pie * ( r ) ² * h = 1520 ––– ( i )



And ,


CSA = 440 cm²



=> 2 * pie * r * h = 440 –––( ii )


Now ,


eq ( i ) divided by eq (ii ) ,


pie * r * r * h / 2 * pie * r * h = 1520 / 440



=> r / 2 = 152 / 44


=> r = 152 / 22


=> r = 6.9


Radius (Approx ) = 7 cm



So ,


2 * 22/7 * 7 * h = 440


=> 44 * h = 440


=> h = 10 cm



height = 10 cm



thanks :)

Answer 2

according to πr²h/2πrh=1520/440=r/2=3.45=r=3.45×2=6.9 =7approx. 2πrh=2×22/7×7×h=440. 44h=440 then bro. h=10