"It is eighty meters long."

Translation: È ottanta metri lungo.

[smeans2]

This may be a dumb question, but why doesn't "lungo" agree with "metri" in number? Isn't it an adjective?

[marziotta]

The whole sentence (with the subject that is implied) would be "Questo è lungo ottanta metri" or "Questa è lunga ottanta metri" "lungo" should agree with the subject, that could be "questo" "questa" "esso" "essa" "lui" "lei". Then, either masculine or feminine, but singular. "È" tells us that it's singular.

[smeans2]

I had a feeling I was missing something that should have been obvious, but thanks for the very helpful explanation.

[jhsaxena]

Is there a reason it isn't "c'È"

[inky1]

È ottanta metri di lunghezza. why is this wrong??