We are trying to find the value of pi 

We measured 4 different circular shapes

Shape	Circumference	Diameter	C/D
1	550mm	196mm	2.801
2	490mm	165mm	2.96
3	320mm	107mm	2.99
4	350mm	90mm	3.66

(2.801+2.96+2.99+3.66)/4 = 3.102