Graphical representation of the relationship between pi and √2

Doctor Jeng told us "how to use a graph to represent the relationship between pi and √2"

1. set the radius of the circle to 1

2. use Pythagorean's theorem to calculate the side length of the small square as √2

3. calculate 1/4 of the circumference of the circle as pi/2

In conclusion, the relationship between pi and √2 is found.