Question 513658
The circumference of a circle is 2πr 
And the circumference is equal to (6*r+10)
π=22/7
So 6r+10=2πr 
   {{{6r+10=2*(22/7)*r}}}
   {{{6r+10=(44/7) * r}}}   
   {{{7(6r+10)=44r}}}
   {{{42r+70=44r}}}
   {{{70 = 44r-42r}}}
   {{{70 = 2r}}}
    r = 35

Hence the radius is 35meters