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A right circular cylinder of radius 3.5 cm and height 10 cm has a hemisphere of the same radius hollowed out from the top. The exposed area is the cylinder's curved surface + the bottom circle + which extra surface?

Class 10Surface Area of Combined SolidsMensuration
  • Athe inner curved hemispherical surface
  • Bthe full surface area of the hemisphere
  • Canother full top circle
  • Dnothing extra

Step-by-Step Solution

Scooping a hemisphere from the top removes the top circle but exposes the inner curved hemispherical wall (2*π*).
Answer: A) the inner curved hemispherical surface

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