Question

The total surface area of a cone whose radius is r/2 and slant height is 2l is
a) 2¶r(l+r)
b) ¶r(l+r/4)
c) ¶r(l+r)
d) 2¶rl​

Answer 1

Step-by-step explanation:

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+

4

r

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Answer 2

Answer:

$\pi \: r(1 + \frac{r}{4} )$

is your Answer :)

Step-by-step explanation:

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