Surface Areas & Volumes | Exercise 13.4 | Q6

Class 9 Maths | NCERT Exercise Solutions | Surface Area of Sphere

Question 6: Find the radius of a sphere whose surface area is 154 cm2.


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Explanatory Answer | Exrecise 13.4 Question 6

Surface area of sphere = 154 cm2
Let r be the radius of the sphere.
Surface area of sphere = 4 × π × r2
Take π = \\frac{22}{7})
154 = 4 x \\frac{22}{7}) x r2
r2 = 154 x \\frac{7}{22 \times 4})
r2 = \\frac{7}{2}) x \\frac{7}{2})
Take square root on both sides: r = \\frac{7}{2})
Radius of the sphere = 3.5 cm

 


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