lid piece dimensions

	A	B	C
1	Based on circle
2	angle subtended	90	degrees
3	outer radius	28.66	cm
4	thickness of pieces	1.8	cm
5	difference in radii	1.802
6	inner radius	26.86	cm
7	outer arc length	45.02	cm
8	inner arc length	42.19	cm
9	number of pieces	15	pieces
10	outer length of each piece	3.00	cm
11	inner length of each piece	2.81	cm
12	angle at centre	6.00	degrees
13	angle on short side	93.00	degrees
14	angle on long side	87.00	degrees
15
16
17	Regular polygon
18	number of sides of full polygon	60	sides
19	side to radius ratio	0.1047
20	outer side length	3.00	cm
21	inner side length	2.81	cm
22	triangle base	0.0943	cm
23	triangle angle	3.00
24	angle on short side	93.00
25	angle on long side	87.00
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