Question

Example-4. A company wants to manufacture 1000 hemispherical basins from a thin steel
sheet. If the radius of each basin is 21 cm., find the area of steel sheet required to manufacture the
above hemispherical basins?​

Answer 1

Answer:

277.2 m^2

Step-by-step explanation:

Given,

Radius of the hemisphencal basin = 21cm

To find out,

Find the area of steel sheet required to manufacture the 1000 hemispherical basins.

Solution:

Surface area of a hemispherical basin = 2πr^2 = 2 × 22/7 ×21 ×21 = 2772

Therefore the area of the steel sheet required for one basm is 2772cm^2.

Total area of sheet required for 1000 hemispherical

basins = 2772 X1000

= 2772000 cm^2

= 277.2 m^2

Therefore the area of steel sheet required to manufacture the 1000 hemispherical basins is 277.2 square meters.

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Answer 2

Answer:

• Total area required for 1000 hemispherical basins is 2772000 cm² or 277.2 m².

Step-by-step explanation:

Given

• Radius of the hemispherical basin (r) = 21 cm

To find

• Total area of steel sheet required for 1000 basins.

Solution

S.A of a hemispherical basin = 2πr²

• 2 × 22/7 × 21 × 21
• 2772 cm²

Hence, area of the steel sheet required for one basin:

• 2772 cm²

Total area of steel sheet required for 1000 basins:

• 2772 × 1000
• 2772000 cm² or 277.2 m²