Solution,
Here,
S = Surface area of cone
r = Radius
l = length
Now,
S = πr^2 + πrl
or, S = πr(r + l)
or, S ÷ πr = r + l
or, S ÷ πr - r = l
or, l = S ÷ πr - r
Therefore,the formula for the length will be
l = S ÷ πr - r
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