Step-by-step explanation:
1. Radius=3cm, diameter=6cm
Circumference=3.14×6cm=18.84cm
2. Radius=6in, diameter=12in
Circumference=3.14×12in=37.68in
3. Radius=9mm, diameter=18mm
Circumference=3.14×18mm=56.52mm
Answer:
Brainly.
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