Question 205737
write formula in terms of its radius: S=2pie*r*h+2pie*r squared
--------------
Do you mean solve for r?
S=2pi*r*h+2pi*r^2 (It's the Greek letter pi, not the dessert, pie.)
r^2 + rh = S/2pi
r^2 + rh - S/2pi = 0
-----------------
{{{r = (-h + sqrt(h^2 + 2S/pi))/2}}}
{{{r = (-h - sqrt(h^2 + 2S/pi))/2}}}