Question

the total surface area of a cone whose radius is r upon 2 and slant height 2l​

Answer 1

Step-by-step explanation:

Given radius =r upon 2

slant height =21

total surface are of come =rr(r+1)

therefore

new total surface area of cone -r r upon (r upon 2+21)

=r(r² upon 4 +rl)

rr(1+r upon 4)