the internal and external diameters of a hollow hemispherical vessel are 20 cm and 28 cm respectively. Find the cost of painting the vessel all over at 35 paisa per cm^2
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Answer: Rs. 651.19
Step-by-step explanation:
external radius (R)= 28/2=14cm
internal radius (r) = 20/2=10cm
- External surface area= 2πR²
- internal surface are = 2πr²
Total surface area= external surface area + internal surface area
= 2πR² +2πr²
= 2π(R²+r²)
= 2x22/7 x ( 14)² + (10)²
= 1860.57 cm²
cost = 1860.57 x 35/100
= Rs 651.19
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