Question

A rectangular piece of paper is 22cm metre in length and 10cm in width. it is rolled into a cylinder along its length find the surface area of this cylinder.​

Answer 1

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Step-by-step explanation:

r----22cm

h----10cm

csa= 2/πrh = 22×10

220cm^2(ans)

Answer 2

Answer:

The surface area of this cylinder is 220 cm²

Step-by-step explanation:

Given :

A rectangular piece of paper length 22 cm and 10cm in width.

Paper is rolled into a cylinder along its length

To find :

The surface area of this cylinder

Solution :

★ When rectangular piece of paper rolled into a cylinder along its length.

Length become circumference Width become height,

So,

Find the radius ;

Circumference = 22 cm

Circumference = 2 π r

⇒ 2 π r = 22

⇒ 2 × 22 / 7 × r = 22

⇒ 44 / 7 × r = 22

⇒ 44 r = 22 × 7

⇒ 44 r = 154

⇒ r = 154 / 44

⇒ r = 3.5 cm

Curved surface area = 2 π r h

⇒ 2 × 22 / 7 × 3.5 × 10

⇒ 220

Curved surface area = 220 cm²

Therefore,

The surface area of this cylinder is 220 cm²