Question

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]

Answer 1

ANSWER

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....