A solid object is made up of a hemisphere and a cylinder. The radius of the hemisphere is equals to the radius of the cylinder. If the height of a cylinder is 80cm and the height of the solid object is 94cm then find the surface area of that solid object. [ans: 8888cm²]
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For all figures,
r=7 cm
l (slant height)= h (height of cylinder)=4 cm
T.S.A of the figure= C.S.A of Cone+C.S.A of cylinder +C.S.A of hemisphere.
CSA of cone: πrl=(3.14)×(7cm)×(4cm)=87.92 cm2
CSA of cylinder: 2πrh=(2)×(3.14)×(7cm)×(4cm)=175.84 cm2
CSA of hemisphere: 2πr2=(2)×(3.14)×(7cm)2=307.72 cm2
Adding all: TSA of figure= 571.48 cm2
it is just a hint... hope it help....
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