The circumference is given by [tex] 2 \pi r=14\;cm [/tex]. The radius is
[tex] r=\frac{7}{\pi} [/tex]. The surface area of the grape fruit is
[tex] S=4\pi r^2 [/tex].
Substituting numerical values,
[tex] S=4\pi (\frac{7}{\pi}) ^2\\
S=615.75\;cm^2\\
S = 616\;cm^2\\ [/tex]
