0

I think the single dashes (hyphens) should be placed between the numbers and units in this sentence:

...in a cylinder of 3-inch radius and 24-inch length.

Is that correct and should hyphens be added to this second sentence?

...making a trench nearly 15 feet wide and more than 30 feet long.

2

I believe this is a style issue rather than a question of grammar. That is, different publishers may have different preferences for when to use a hyphen.

In the style I learned (for academic technical writing), a hyphen is used when combining words to make an attributive. For example, "a fifteen-foot boat" or "a two-year assignment". A hyphen is not used when using a measurement as a noun, as in "the boat was fifteen feet long" or "the assignment lasted two years".

You can see that this style matches your examples.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.