Questions & Answers about Duono de la teksaĵo estas silko.
Because duono is a noun meaning half or one half.
In this sentence, duono is the main word of the subject:
Duono de la teksaĵo = half of the textile/fabric
By contrast, duona is an adjective meaning half- or partial, and it has to modify another noun:
- duona horo = half an hour
- duona pano = half a loaf
So here, duono is correct because we are naming a thing: a half.
It means of the textile/fabric.
Esperanto commonly uses de to show the whole that a fraction belongs to:
- duono de la kuko = half of the cake
- triono de la klaso = a third of the class
- parto de la mono = part of the money
So duono de la teksaĵo literally means half of the textile/fabric.