Question 54763
{{{A=pi*r^2}}}  if A=113.04sq ft  and {{{pi}}}=3.14  what is r
Solve the formula for r and plug in your numbers.
{{{A/(pi)=(pi)*r^2/(pi)}}}
{{{A/(pi)=cross((pi))*r^2/cross((pi))}}}
{{{A/(pi)=r^2}}}
{{{sqrt(A/(pi))=sqrt(r^2)}}}  (you don't need to use + or - because you can't have a negative radius.)
{{{r=sqrt(A/(pi))}}}  A=113.04 ft^2 and {{{(pi)}}}=3.14
{{{r=sqrt(113.04ft^2/(3.14))}}}
{{{r=sqrt(36ft^2)}}}
{{{r=sqrt((6ft)(6ft))}}}
{{{highlight(r=6 ft)}}}
Happy Calculating!!!