 |
| ||
| |||
|
| Math Central | Quandaries & Queries |
|
Question from fikile, a parent: By how much must an equatorial cable be extended in order that it runs 1meter above the ground? |
Hi,
The circumference of a circle of radius $r$ units is $2 \times \pi \times r$ units.
Suppose the radius of the Earth is $r$ meters. What is the circumference?
If you extend the cable so that it is $1$ meter above the surface then the radius of the circular cable is $r + 1$ meters. What is its circumference?
Write down the difference of the two circumferences and simplify.
Penny
| ||
| ||
| ||
 |
 |
|
Math Central is supported by the University of Regina and The Pacific Institute for the Mathematical Sciences.