Question 973129

area of the great circle is {{{A = pi*r^2}}} 

given: {{{ pi*r^2=79cm^2}}}=> solve for {{{r}}}

{{{ r^2=79cm^2/3.14}}}

{{{ r^2=25.15923566878981cm^2}}}

{{{ r=sqrt(25.16cm^2)}}}

{{{ r=5.016cm}}}


Surface area of a {{{sphere = 4pi* r^2}}}

{{{sphere = 4*3.14* (5.016cm)^2}}}

{{{sphere = 12.56* 25.16cm^2}}}

{{{sphere = 316.0096cm^2}}}...round it

{{{sphere = 316cm^2}}}