Question

A toy is in the form of a cone of radius 3.5 cm mounted on a hemisphere of same radius. The total height of the toy is 15.5 cm. Find the total surface area of the toy.[Use π = 22/7]

Answer 1

It can be observed that the radius of the conical part and the hemispherical part is same (i.e., 3.5 cm).

Height of hemispherical part = Radius (r) = 3.5 =7/2 cm

Height of conical part (h) = 15.5 −3.5 = 12 cm               

 Slant height(l) of conical part =         

  

Total surface area of toy = CSA of conical part + CSA of hemispherical part

πrl + 2π r²