632 
For by the centre of rotation B Vi VAL the side DIX VIII 
is determined, by the centre of rotation P vir Vii the side 
VIII VII C", by the centre of rotation Pvr vit the side VILC VI. 
If we furthermore draw C' VI in the first place the side VIV 
and in the second place the centre of rotation P'iy y, hence also the 
point Piv v, lying perpendicularly above it, througb which VIV 
must pass, are fixed. 
By means of Piyy we also find the line A'oo Pyyy, on which 
the centre of rotation of all the other sides must lie. 
Now the link-polygon in question DIX VIII VIICVIVIV 
BIA can be completed. 
