C= πd
A=πr²
1. 18·π= 56.5cm
2. 24·π= 75.4yds
3. 2.5·π= 7.9mi
4. 14.5²π= 660.5m²
5. 10.5²π= 346.4ft²
6. 18.25²π= 1046.3in²