Question

Surface Area of a sphere, A grapefruit with C = 14cm.

Answer 1

Surface area SA:
`4\pi r^2`
Circumference C:
`2\pi r` dividing this you get
`7=\pi r` and
`r= (7)/(\pi)`

Now let's input the radius
`r` into the Surface area formula...

`4\pi r^2\rightarrow 4\pi((7)/(\pi))^2=4\pi((49)/(\pi^2))=(196)/(\pi)`