Find the Find the surface area of a sphere of radius : (i) 10.5 cm (

1.	Find the Find the surface area of a sphere of radius : (i) 10.5 cm (ii) 5.6 cm (iii) 14 cm
Answer» Surface area of a sphere = 4πr², where r is radius (i) r is 10.5 cm ⇒ surface area = 4 × (22/7) × (10.5)² = 1386 cm² (ii) r is 5.6 cm ⇒ surface area = 4 × (22/7) × 5.6² = 394.24 cm² (iii) r is 14 cm ⇒ surface area = 4 × (22/7) × 14² = 2464 cm²

Find the Find the surface area of a sphere of radius : (i) 10.5 cm (ii) 5.6 cm (iii) 14 cm

Answer»

Surface area of a sphere = 4πr², where r is radius

(i) r is 10.5 cm

⇒ surface area = 4 × (22/7) × (10.5)²

= 1386 cm²

(ii) r is 5.6 cm

⇒ surface area = 4 × (22/7) × 5.6²

= 394.24 cm²

(iii) r is 14 cm

⇒ surface area = 4 × (22/7) × 14²

= 2464 cm²