A hollow cylindrical tube 20 cm long, is made of iron and its external and internal diameters are 8 cm and 6 cm respectively. The volume of iron used in making the tube is ( = 22/7)

A hollow cylindrical tube 20 cm long, is made of iron and its external

1.	A hollow cylindrical tube 20 cm long, is made of iron and its external and internal diameters are 8 cm and 6 cm respectively. The volume of iron used in making the tube is ( = 22/7)
A.	1760 cu.cm.
B.	880 cu.cm.
C.	440 cu.cm.
D.	220 cu.cm.
Answer» D. 220 cu.cm.

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A hollow cylindrical tube 20 cm long, is made of iron and its external and internal diameters are 8 cm and 6 cm respectively. The volume of iron used in making the tube is ( = 22/7)

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