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

Given: For the conical Part,
height ,h = 4 cm, radius , r = 3 cm
For the cylindrical part,
height ,H = 40 cm, radius ,r = 3 cm
For the hemispherical part,
radius ,r = 3 cm
Slant height of cone (l) = √(h²+r²)
= √(4²+3²) = √(16+9)
= √25 = 5 cm
Curved surface area of hemisphere = 2πr²
= 2×π×3²
= 18π cm²
Curved surface area of cylinder = 2πrH
= 2×π×3×40
= 240π cm²
Curved surface area of cone = πrl
= π×3×5
= 15π cm²
Total area of the toy
= Curved surface area of cone + Curved surface area of cylinder + Curved surface area of hemisphere
= 15π + 240π + 18π
= 273 π cm²
Hence total area of the toy is 273π cm².