Question 1: Find the surface area of a sphere of radius:

(i) 10.5 cm

(ii) 5.6 cm

(iii) 14 cm

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Surface area of sphere = 4 × π × r^{2}

Take π = \\frac{22}{7})

Surface area of sphere = 4 × \\frac{22}{7}) × 10.5 × 10.5

= 4 × 22 × 1.5 × 10.5

**= 1386 cm ^{2}**

Surface area of sphere, r = 4 x π × r^{2}

Take π = \\frac{22}{7})

Surface area of sphere = 4 × \\frac{22}{7}) × 5.6 × 5.6

= 4 × 22 × 0.8 × 5.6

**= 394.24 cm ^{2}**

Surface area of sphere = 4 × π × r^{2}

Take π = \\frac{22}{7})

Surface area of sphere = 4 × \\frac{22}{7}) × 14 × 14

= 4 × 22 × 2 × 14

**= 2464 cm ^{2}**

Class 9 Maths

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