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Cone: total surface area or volume straight from radius (or diameter) and height

This type of question, asked 2 times: 29 Jan 2022 Tier II, 18 Jan 2025 Tier II. All 2 questions below, oldest first.

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  1. Question 1

    29 Jan 2022 Tier II

    2
    The radius of a solid right circular cone is 36 cm and its height is 105 cm. The total surface area (in cm2\text{cm}^2) of the cone is:

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  2. Question 2

    18 Jan 2025 Tier II

    26
    Find the volume (in cm3\text{cm}^3, rounded off to 2 decimal places) of a right circular cone of diameter 12 cm and height 5 cm. [Use π=227\pi = \frac{22}{7}]

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