Question

How much metal sheet required to prepare a cylindrical pipe 10 cm long and radius is 7cm?

Answer 1

total surface area of cylinder is πr(h+r)

= 22÷7 ×7(10+7)
= 154÷7(17)
= 22×17
= 374.
Therefore, Required metal sheet is 374cm.

Answer 2

surface area of calendar
=πr(h+r)
=22÷7×7(10+7)
=22(17)
=22×17
=374.
374cm metal sheet required to prepare a cylindrical pipe.

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