De or het hanging?

The correct Dutch article is:

de hanging

Rule Words ending in -ing: almost always de. See the rule
Meaning (Dutch) het hangen

How to use hanging

the hangingde hanging
this hangingdeze hanging
that hangingdie hanging
our hangingonze hanging
your hangingjouw hanging
every hangingelke hanging
which hanging?welke hanging?
a big hanging / the big hangingeen grote hanging, de grote hanging

Dutch words ending in hanging

ophanging | wielophanging | achterwielophanging | voorwielophanging | motorophanging | verhanging

In compound words, the last part decides the article. See the rule

Meaning, plural, diminutive, pronunciation and translations: WikiWoordenboek (Dutch Wiktionary) (CC BY-SA 4.0). Example sentences: Tatoeba (CC BY 2.0 FR).