Answer:
A fence of 1964 m² is needed
Step-by-step explanation:
» Amount needed will be the area of the circular fence.
[tex]{ \tt{area = \pi {r}^{2} }} \\ { \tt{area = 3.14 \times ( {25}^{2} )}} \\ { \boxed{ \tt{ \: area = 1963.5 \: m {}^{2} }}}[/tex]
