Question

a cylinder is surmounted by a cone . common diameter is 14cm . maximum height of solid is 41 cm . if the height of conical portion is 21 cm , find the volume .​

Answer 1

Answer:

Since total height of toy is 31cm,

So, the height of cone is (h)=31−7=24cm

Also,radius of cone(r)=7cm

Now, l=  

7  

2

+24  

2

 

​

=  

49+576

​

=  

625

​

=25cm

Now, total surface area of toy=2πr  

2

+πrl=πr(2r+l)

=  

7

22

​

×7(14+25)cm  

2

 

=22×39=858sq.cm

Hence total surface area is 858 sq.cm

Step-by-step explanation: