What is the reading of 弓形? The word has three different readings which are , , and . Unfortunately, there does not seem to be much distinction between these three readings. Is this simply a case wherein all readings are acceptable or is one reading more common than the others?

The kun-reading is the safest reading at least in ordinary speech and writings.

may be read in some technical fields I'm not good at, but I can say it's rare. In mathematical contexts, this word is normally called (see this video and this Wikipedia article for example), not . I guess this is because there is a more common word with the same reading, ("spherical").

is a common word, but it's usually written as in modern Japanese.