### Bucket of Water

Lisa's bucket weighs 21 kg when full of water. After she pours out half the water it weighs 12 kg. What is the weight of the empty bucket?

### How Far Does it Move?

Experiment with the interactivity of "rolling" regular polygons, and explore how the different positions of the red dot affects the distance it travels at each stage.

### Speeding Up, Slowing Down

Experiment with the interactivity of "rolling" regular polygons, and explore how the different positions of the red dot affects its speed at each stage.

# Spiral Snail

##### Age 11 to 14 Short Challenge Level:

Answer: $(6,5)$

Tracing the journey

The distance it moves East $=2-4+6-8+10=6$.
The distance it moves North $=1-3+5-7+9=5$.