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Find the total surface area of …

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Find the total surface area of cone radius 3cm height 4cm

    • Posted by Pinky Jain 3 years, 10 months ago

    CBSE > Class 09 > Mathematics
    • 2 answers

    Indhu Indhu 3 years, 10 months ago

    r=3 cm and h=4 cm Let l be the slant height of the cone. Then, l2=r2+h2 l2=32+42 l=5 cm Therefore, Area of the curved surface = πrl=722​×3×5=47.14 cm2

    1Thank You

    Gaurav Seth 3 years, 10 months ago

    the formula to find total surface area of cone is 
    πr(r+l)
    to find l use l²=r²+h²

    ∴l²=3²+4²
         =9+16
         =25
    ∴l=5cm

    now using π r ( r + l )
                     3.14 *3(3+5)
                      3.14 *3(8)
                     9.42*8
                     75.36 cm²

    3Thank You

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