Question

Find the total surface area of hemi sphere, whose radius is 7 cm.

1. 472 cm2
2. 492 cm2
3. 422 cm2
4. 462 cm2

Answer 1

Correct Answer - Option 4 : 462 cm2

Given:

Radius of hemi sphere = 7 cm

Formula Used:

Total surface area of hemi sphere = 3π × r²

Calculation:

Total surface area of hemi sphere = 3π × r²

⇒ 3 × (22/7) × 7 × 7

⇒ 3 × 22 × 7

⇒ 462 cm²

∴ The total surface area of hemi sphere is 462 cm².