Question

The circumference of a standard bowling ball is about 27 in. To the nearest unit, how many square inches is the surface area of 100 bowling balls? Explain.

Answer 1

The surface area of a sphere is
`S=4 \pi r^(2)` where r is the radius;
The circumference is
`2 \pi r=27 in` so that
`r= (27)/(2 \pi )=4.5 in` using this value we can evaluate the surface area of 1 ball as:

`S=4 \pi r^(2) =4 \pi (4.5)^(2) =254.3 in^(2)`
For 100 ball you get:
`100*254.3=25430 in^(2)`