Q. 83.5( 26 Votes )

In figure 7.11, a toy made from a hemisphere, a cylinder and a cone is shown. Find the total area of the toy.


Answer :

Radius of circular region, r = 3cm


Height of Cylinder, H = 40cm


Height of cone, h = 4cm


As we know,


Surface area of hemisphere, AH = 2πr2


Surface area of cylinder, Acy = 2πrH


Surface area of cone is,




ACO = 5πr


Total area = AH + ACY + ACO


On substituting the values, we get,


Total area = πr(2r + 2H + 5)


Total area = π× 3× (6 + 80 + 5)


Total area = 273π


total area of the figure is 273π sq. cm


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