Question

A closed metallic cylinder has its diameter 56 cm and it is 2.25m height find the cost of the metal used to make the cost of ₹ 80 per square metre.​

Answer 1

Answer:

The cost of metal required is Rs. 356.224

Step-by-step explanation:

Given :

• A closed metallic cylinder has its diameter 56 cm

• Height of metallic cylinder = 2.25 m

• Rate of metal = ₹ 80 per square metre

To Find :

• The cost of metal required

Solution :

Diameter = 56 cm

★ Find the radius (r) :

⇒ r = Diameter / 2

⇒ r = 56 / 2

⇒ r = 28 cm

★ Convert the radius cm to m

1 m = 100 cm

⇒ 28 / 100

⇒ 0.28 m

⇒ r = 0.28 (in m)

★ TSA(Total surface area) :

TSA of cylinder = 2 π r (h + r)

⇒ 2 × 22 / 7 × 0.28 ( 2.25 + 0.28)

⇒ 4.4528 m²

★ The Cost of metal :

⇒ 4.4528 × 80

⇒ 356.224

Therefore,

The cost of metal required is Rs. 356.224

Answer 2

Answer:

The cost of metal required is Rs 356.224

Step-by-step explanation:

Given

Diameter = 56 cm

r = diameter / 2

r = 56/2

r = 28 cm

Now

Convert the radius cm to m

1 m = 100 cm

28 cm = 0 . 28 m

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

2×22/7×0.28 ( 2.25 + 0.28 )

4.4528 sq.m

Now ,

Cost of metal required = 4.4528 × 80

= Rs 356.224

Therefore ,

The cost of metal required is Rs 356.224 .

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