Question

9. A closed metallic cylinder has its base diameter 56 cm and it is 2.25 m high. Find
the cost of the metal used to make it if it costs 80 per square metre.
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Answer 1

$\bf\underline{\underline{\pink{SOLUTION:-}}}$

Question

• A closed metallic cylinder has its base diameter 56 cm and it is 2.25 m high. Find
• the cost of the metal used to make it if it costs 80 per square metre?

Answer

• Rs. 356.224

Given

• Base diameter = 56cm
• Height = 2.25m

To Calculate

• Find the cost of the metal used to make it if it costs 80 per square metre?

Explanation

Base diameter = 56cm

Radius = 56/2 = 28cm = 0.28m

Height = 2.25m

Total Surface area of Closed Metallic Cylinder = 2πr(h+r)

⇢ 2×22/7×0.28 (2.25+0.28)

⇢ 2×22/7×0.28×2.53

⇢ 4.4528m²

Cost of making per square metre of metal = Rs.80

So,

Cost of making Whole metal = 4.4528×80

⇢ Rs. 356.224

$\bf\underline{\underline{\pink{HENCE:-}}}$

• Rs. 356.224

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