Find the volume of iron used to make a hill cylinder of height 9cm and whose internal and external radius are 2.1 cm and 2.8 cm respectively
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Answer:
97.02 cm²
Step-by-step explanation:
Volume of a hollow cylinder = πh(R²-r²)
{π = 22/7 R = 2.8 cm r = 2.1 cm h = 9 cm}
=> 198/7(7.84-4.41)
=> 198/7*3.43
=> 198*0.49
=> 97.02 cm2
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