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Volume of the Hollow cylinder
Cylinder : 
A cylinder is a closed solid that has two parallel (usually circular) bases connected by a curved surface. 
Formulae: 
Volume of the HollowCylinder= πh(R^{2}r^{2}), where Router radious,rinner radious hheight 
Example: 

Find the volume of the given hollow cylinder. 
Height=15, Outer Radious=8 , Inner radious=6 
Volume of the HollowCylinder= πh(R^{2}r^{2}), 
= 3.14 * 15 *(8^{2}6^{2}) 
= 3.14 * 15 *(6436) 
= 3.14 * 15 *(6436) 
Volume of the HollowCylinder=1318.8000 