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Hemisphere curved surface area 2 pi r^2: area, painting cost or diameter

This type of question, asked 3 times: 27 Jul 2023 S1, 17 Sep 2025 S2, 19 Sep 2025 S2. All 3 questions below, oldest first.

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  1. Question 1

    27 Jul 2023 S1

    71
    A hemispherical bowl has a radius of 7 cm. It is to be painted from inside as well as outside. Find the cost of painting it at the rate of Rs.40 per 20 cm2\text{cm}^2 ? (Take thickness of the bowl as negligible).

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  2. Question 2

    17 Sep 2025 S2

    63
    A hemispherical dome covers a circular area of diameter 20 m. What is the approximate curved surface area of this dome?

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  3. Question 3

    19 Sep 2025 S2

    62
    If the curved surface area of a hemisphere is 154 cm2\text{cm}^2 find its diameter.

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