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प्रश्न
Find the surface area of sphere of radius 4.2 cm.
बेरीज
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उत्तर
Given: Radius r = 4.2 cm.
Step-wise calculation:
1. Surface area formula: S = 4πr2.
2. r2 = (4.2)2
= 17.64 cm2
3. 4r2 = 4 × 17.64
= 70.56
4. S = 70.56 πcm2
= 70.56 × 3.141592653589793...
= 221.6707776... cm2
Surface area = 70.56 πcm2 ≈ 221.67 cm2.
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