The circumference of the grape fruit is [tex] 2\pi r=14 [/tex], where [tex] r [/tex] is the radius. Solving for r,
[tex] r=\frac{7}{\pi} [/tex].
The surface area of a sphere with radius r is [tex] S=4 \pi r^2 [/tex]. Substituting numerical value of r,
[tex] S=4 \pi r^2 =4 \pi (\frac{7}{\pi} )^2 =62.39 [/tex].
The surface area of the grape fruit is [tex] 62.39\;cm^2 [/tex].
