Question

The external and internal diameters of a hollow hemi-spherical vessel are 16 cm and 12 cm respectively. The cost of painting 1sq. cm of surface is ₹ 2. Find the cost of painting the vessel all over.
[π= 22/7]​

Answer 1

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Refer to the attachment given above hope this will help you ❤️

Answer 2

$\huge\mathfrak{Bonjour!!}$

$\huge\bold\purple{Answer:-}$

⏩ Total surface area = 2πR² + 2πr² + (πR² - πr²)

Where R is external radius and r2 is the internal Radius.

= 3πR² + πr²

= π (3R² + r²)

= π (3(8)² + (6)²]

= 22/7 × [228] cm²

= 716.57 cm²

Therefore,

Cost of painting the vessel all over will be,

₹ (716.57 × 2)

= ₹ 1433.14

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Hope it helps...:-)

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