a hollow cylindrical copper pipe is 2m long its outer and inner diameter are 7cm and 5cm respectively find the volume of the copper used in making pipe
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Length or height of pipe=210cm
Outer diameter =10cm ⇒ outer radius =5cm
Inner diameter=6cm ⇒ inner radius=3cm
Volume of copper used= Volume of cylinder
=π(r22−r12)×h=π(52−32)×210cm3=722×210×(5+3)×(5−3)cm3=3360cm3
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