Question

a rectangular ribbion of width 21cm is folded along its width and a cylinder of radius 20cm is formed find the curved surface area of cylinder​

Answer 1

curved surface area= 2x pie x r x h

= 2x22/7x20x21

= 2640cm²

Answer 2

Curved surface area of cylinder is 2640 square centimeter

Solution:

Given that,

A rectangular ribbon of width 21 cm is folded along its width and a cylinder of radius 20 cm is formed

Therefore,

When a rectangular ribbon of width 21 cm is folded along its width to form a cylinder, width 21 cm becomes height of cylinder

Dimensions of cylinder are:

Radius = 20 cm

height = 21 cm

Find the curved surface area of cylinder

$C.S.A = 2 \times \pi \times r \times h\\\\C.S.A = 2 \times \frac{22}{7} \times 20 \times 21\\\\C.S.A = 2 \times 22 \times 20 \times 3\\\\C.S.A = 2640\ cm^2$

Thus, curved surface area of cylinder is 2640 square centimeter

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