A metl pipe is 77 cm long. The inner diameter of a cross section is 4 cm the outer diameter is 4.8 cm. Find its inner curved surface area
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length =77 cm
inner diameter=4cm r=4cm÷2
r=2cm
inner surface area
=2πrh
=2 × 22/7 × 2 × 77
=2×2×22×11
=88×11
=968 cm^2
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