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What is the total surface area …

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What is the total surface area of a hemisphere of radius r? (a) 4πr2(b) πr2(c) 2πr2(d) 3πr2

    • Posted by Neshok Ls 5 years, 1 month ago

    CBSE > Class 09 > Mathematics
    • 1 answers

    Gaurav Seth 5 years, 1 month ago

    The surface area of a sphere of radius r is 4πr 2
     . Half of this is 2πr 2
     .
    If you have a hemispherical object then it has a base which is a circle of radius r.
    The area of a circle of radius r is πr 2
      and thus if the hemisphere is meant to include the base then the surface area is  2πr 2 +πr 2
     =3πr 2

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