Are platyhellmintes and annelids segmented?
Here are the first sentences from the wikipedia articles for platyheminthes and annelids:


  The flatworms, or Platyhelminthes, Plathelminthes, or platyhelminths (from the Greek πλατύ, platy, meaning "flat" and ἕλμινς (root: ἑλμινθ-), helminth-, meaning "worm")2 are a phylum of relatively simple bilaterian, unsegmented, soft-bodied invertebrates.
  
  The annelids (Annelida, from Latin anellus, "little ring"),2[n 1] also known as the ringed worms or segmented worms, are a large phylum, with over 17,000 extant species including ragworms, earthworms, and leeches.