Question

What is the total surface area of a cone having radius  r/2 and height 21?​

Answer 1

Answer:

Total surface area of cone=πr(r+l)

Given, radius =

2

r

and slant height =2l

Therefore new total surface area of cone =π

2

r

(

2

r

+2l)

=π(

4

r

2

+rl)

=πr(l+ 4r )

Answer 2

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