[tex]area \: = \pi {r}^{2} \\ circumference = 2\pi \: r[/tex]
where r = radius
[tex]\pi {r}^{2} = 28.26 \: {yd}^{2} \\ {r}^{2} = 28.26 \div \pi \\ {r}^{2} = 8.99 = 9 \\ \sqrt{ {r}^{2} } = r = \sqrt{9} = 3[/tex]
circumference = C
[tex]c = 2\pi \: r = 2(3) \times \pi \\ = 18.85 \: yd = 18.9 \: yd[/tex]
