It's probably a Tape worm. Tape worm segmnts filled with eggs are passed out of the host body with wastes,e.g. your cat's rectum, where they release their eggs. Medications such as "Nemex" can be administered only from a veternatian, worming medicine sold in stores will not kill tapeworms.
1inch is bigger than 1cm as there is 2.5cm's in 1inch. Hope this helps :)
2.54cm.
1inch
12
1inch
25.4
Bamboo
about 6ft 1inch
he is 6ft 1inch
1 in = 0.0254m
about 1inch or so
154.9