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The surface area of a sphere of radius 7 cm is

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Bihar STET Paper I: Mathematics (Held In 2019 - Shift 1)
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  1. 166 cm2
  2. 616 cm2
  3. 661 cm2
  4. none of these

Answer (Detailed Solution Below)

Option 2 : 616 cm2
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Detailed Solution

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Given:

Radius of sphere = 7 cm

Formula used:

The surface area of a sphere = 4πr2

Calculation:

The surface area of a sphere = 4 × π × (7)2

⇒ 4 × (22/7) × 7 × 7

⇒ 4 × 154

⇒ 616 cm2

∴ The required surface area is 616 cm2.

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