The formula for the length of the cone is given by l = (S/π) - r^2, if the volume of the cone is S = πl + πr^2.
According to the given question.
The surface area of the cone is given by
S = πl + πr^2
Therefore,
The formula for the length of the cone is given by
S = πl + πr^2
⇒ S = π(l + r^2)
⇒ (S/π) = l + r^2
⇒ (S/π) - r^2 = l
or l = (S/π) - r^2
Hence, the formula for the length of the cone is given by l = (S/π) - r^2, if the volume of the cone is S = πl + πr^2.
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The formula for perimeter of a square is 4l
I.e the addition of all its lengths
Since the perimeter is 100ft
Each length is 100/4
=25ft