Question

Find the surface area of a grapefruit with circumference of 14 cm

Answer 1

The answer is 62 cm^2!

Answer 2

The circumference of the grape fruit is $2\pi r=14$, where $r$ is the radius. Solving for r,

$r=\frac{7}{\pi}$.

The surface area of a sphere with radius r is $S=4 \pi r^2$. Substituting numerical value of r,

$S=4 \pi r^2 =4 \pi (\frac{7}{\pi} )^2 =62.39$.

The surface area of the grape fruit is $62.39\;cm^2$.