Question

The diameter of hemisphrical lid is 2 metre. 500 hemispherical lids are prepared in a factory. Find the expense to paint outer surface of lids at Rs.20 per m².(π = 3.14)

Answer 1

Answer:

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Answer 2

Answer:

Expense to paint outer surface of lids :62800 Rs

Step-by-step explanation:

Curved surface area of Hemispherical lid

$</strong><strong>= \boxed{2\pi \: {r}^{2}}$

Radius of Hemisphere lid = 1 m

CSA of Hemisphere

$= 2 \times 3.14 \times ( {1)}^{2} \\ \\ = 6.28 \: {m}^{2 }$

CSA of 500 Hemispherical lids

$= 6.28 \times 500 \\ \\ = 3140 \: {m}^{2}$

To find the expense to paint outer surface of lids at Rs.20 per m² multiple the CSA with cost

$= 3140 \times 20 \\ \\ = 62800 \: Rs$