Question

Find the curved surface area, total surface area and volume of a cone whose base diameter is 12 cm and height 8cm. ( take π = 3.1)​

Answer 1

R.E.F image

OA=16cm,AB=l

l=  

16  

2

+12  

2

 

​  

=  

256+144

​  

 

l=20cm

curved surface Area,

C.S.A=πrl=3.14×12×20=753.6cm  

2

 

Total surface Area,

T.S.A=πr(r+l)=3.14×12[12+20]=1205.76cm  

2