Question 536369
Surface area of a cone is {{{SA=pi*rs+pi*r^2}}}.<P>
Here r=12 and SA=1050.  {{{r^2=144}}}<P>
{{{1050=pi*12*s+pi*144}}}<P>
Subtract the {{{pi*144}}} from both sides.<P>
{{{1050-(3.141592*144)=3.141592*12*s}}}<P>
Divide both sides by the 3.141592(which is pi)*12.<P>
{{{(1050-(3.141592*144))/(3.141592*12)=s=15.852=15.8}}}

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