Question

Solution:-

Diameter = 28 cm
Radius = 28/2 = 14 cm
Height = 17 cm
A margin of 2 cm is given for folding it over the top and bottom, so height is increased by (2 + 2) = 4 cm
Cloth required in covering = Lateral surface area = 2πrh
⇒ = 2*22/7*14*(17 + 2 + 2)
⇒ 2*22/7*14*21
⇒ 12936/7
⇒ 1848 cm²

Let total cloth purchased be 'x' cm
Cloth wasted = x/12
Therefore,
x = x/12 + 1848
⇒ 12x = x + 22176
⇒ 12x - x = 22176
⇒ 11x = 22176
⇒ x = 2016
Total cloth purchased is 2016 cm²

Answer 1

Answer:

2016 cm²

Step-by-step explanation:

Diameter = 28 cm

Radius = 28/2 = 14 cm

Height = 17 cm

A margin of 2 cm is given for folding it over the top and bottom, so height is increased by (2 + 2) = 4 cm

Cloth required in covering = Lateral surface area = 2πrh

⇒ = 2*22/7*14*(17 + 2 + 2)

⇒ 2*22/7*14*21

⇒ 12936/7

⇒ 1848 cm²

Let total cloth purchased be 'x' cm

Cloth wasted = x/12

Therefore,

x = x/12 + 1848

⇒ 12x = x + 22176

⇒ 12x - x = 22176

⇒ 11x = 22176

⇒ x = 2016

Total cloth purchased is 2016 cm²