NCERT Class 9 Solutions: Surface Areas and Volumes (Chapter 13) Exercise 13.4 – Part 1

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Q-1 . Find the surface area of a sphere of radius:

  1. Equation

  2. Equation

  3. Equation

Solution:

Formula for calculating the surface area of sphere.

Surface Area of a Sphere

Formula for calculating the surface area of sphere.

  1. Radius of the sphere (r) Equation

    Surface area

    • Equation

    • Equation

    • Equation

  2. Radius of the sphere (r) Equation

    Surface area

    • Equation

    • Equation

    • Equation

  3. Radius of the sphere (r) Equation

    Surface area

  • Equation

  • Equation

  • Equation

Q-2 Find the surface area of a sphere of diameter:

  1. Equation

  2. Equation

  3. Equation

Solution:

  1. Equation ( Equation )

    Surface area

    • Equation

    • Equation

    • Equation

  2. Equation ( Equation )

    Surface area

    • Equation

    • Equation

    • Equation 2

  3. Equation ( Equation )

    Surface area

  • Equation

  • Equation

  • Equation

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