- Pedalling a bicycle requires moving the pedals in a circular motion
- Pedals are part of a bicycle for pedalling
- Therefore, the pedals are the part of a bicycle that moves in circular motion

Hence, the pedals are the part of a bicycle that moves in circular motion
Q: Which part of a bicycle BEST moves in a circle?
Context:
- Pedalling a bicycle requires moving the pedals in a circular motion 
- Pedals are part of a bicycle for pedalling