Question

A rectangular sheet of paper, 44 cm× 20 cm, is rolled along its length to form a cylinder. Find the total surface area of the cylinder thus generated.


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Answer 1

Answer:

❀Given:

Dimensions of rectangular sheet of paper = 44cm × 20cm

Circumference of base becomes = 44 cm

By using the formula,

Circumference of base = 2πr

So, 2πr = 44

2 × 22/7 × r = 44

r = 44×7 / 44

= 7cm

Radius = 7cm

Height = 20cm

∴ Total surface area of cylinder = 2πr (h+r)

= 2 × 22/7 × 7 (20 + 7)

= 2 × 22/7 × 7 × 27

= 1188 cm2

Answer 2

Step-by-step explanation:

●︿●$⇢12 \times 35 = 12 \times (30 + 5)$

$= 12 \times 30 + 12 \times 5$

$= 360 + 60$

$= 420$