* 1 foot equals 0.3048 meters.
* Diameter is the distance across a circle through its center.
Calculation:
1. Diameter in feet: 100 feet
2. Conversion factor: 1 foot = 0.3048 meters
3. Multiply diameter in feet by the conversion factor: 100 feet * 0.3048 meters/foot = 30.48 meters
Therefore, a 100-foot diameter is equal to 30.48 meters.
