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Radius = 4:
- Diameter = 8
- Area = 50.24
- Circumference = 25.12
Diameter = 16:
- Radius = 8
- Area = 200.96
- Circumference = 50.24
Area = 78.5:
- Radius = 5
- Diameter = 10
- Circumference = 31.4
Circumference = 12.56:
- Radius = 2
- Diameter = 4
- Area = 12.56