Skip to main content
### Number and algebra

### Geometry and measure

### Probability and statistics

### Working mathematically

### For younger learners

### Advanced mathematics

# Coordinates of Corners

For ideas on how this problem and others from the Dotty Grids Collections can be used in the classroom, you may be interested to read this article.

## You may also like

### Just Rolling Round

### Is There a Theorem?

Or search by topic

Age 11 to 16

- Problem
- Student Solutions
- Teachers' Resources

For ideas on how this problem and others from the Dotty Grids Collections can be used in the classroom, you may be interested to read this article.

P is a point on the circumference of a circle radius r which rolls, without slipping, inside a circle of radius 2r. What is the locus of P?

Draw a square. A second square of the same size slides around the first always maintaining contact and keeping the same orientation. How far does the dot travel?