Question 6: Find the radius of a sphere whose surface area is 154 cm^{2}.

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Surface area of sphere = 154 cm^{2}

Let r be the radius of the sphere.

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

Take π = \\frac{22}{7})

154 = 4 x \\frac{22}{7}) x r^{2}

r^{2} = 154 x \\frac{7}{22 \times 4})

r^{2} = \\frac{7}{2}) x \\frac{7}{2})

Take square root on both sides: r = \\frac{7}{2})

**Radius of the sphere = 3.5 cm**

Class 9 Maths

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