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Curved surface area of a cone …

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Curved surface area of a cone is 308 cm square and its slant height is 14 cm. 1)find the radius of the base . 2)total surface area of the cone

    • Posted by Aachman Mishra 5 years, 4 months ago

    CBSE > Class 09 > Mathematics
    • 1 answers

    Yogita Ingle 5 years, 4 months ago

    Given : Curved surface area of the cone = 308 sq cm and Slant height or l = 14 cm.
    Curved surface area of the cone = πrl
    308 = 22/7*r*14
    r= (308*7)/(22*14)
    r = 7 cm
    Total surface area of the cone = πr(r+l)
    = (22/7*7)(7+14)
    = 22*21
    Total surface area of the cone = 462 sq cm
    So, the radius of the base of the cone is 7 cm and the total surface area of the cone is 462 sq cm.

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