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Hollow hemispherical bowl/shell: volume of material from inner and outer radius

The same question, asked 2 times: 21 Jul 2023 S4*, 18 Sep 2025 S3. Every wording below, oldest first.

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  1. Question 1

    21 Jul 2023 S4

    67
    If the inner radius of a hemispherical bowl is 5 cm and its thickness is 0.25 cm, then find the volume of the material required in making the bowl. (use π=227\pi = \frac{22}{7}) (Rounded up to two places of decimals).

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  2. Question 2

    18 Sep 2025 S3

    62
    The inner and outer radius of a hollow hemispherical shell are 7 cm and 14 cm respectively. Find the approximate volume of the metal used.

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