Question

A fez, the cap used by the Turks, is shaped like the
furstum of a cone. If its radius on the open side is 10
cm, radius at the upper base is 4 cm and its slant height
is 15 cm, find the area of material used for making it.​

Answer 1

Answer:

Given:  

Radius (r) of upper circular end =4 cm

Radius (R) of lower circular end =10 cm

Slant height (l) of frustum =15 cm

Area of material used for making the fez = CSA of frustum + Area of upper circular end

=π(R+r)l+πr  

2

 

=π(10+4)×15+π×4  

2

 

=210π+16π=  

7

226×22

​  

 

=710  

7

2

​  

  cm  

2

 

Therefore, the area of material used for making it is 710  

7

2

​  

  cm  

2

.

Step-by-step explanation: