i think this has an error

The sides of this wallet are three inches long

There are many errors in this English translation. I suggest that a better translation is: "The side of this wallet is three inches long." or "The sides of this wallet are three inches long."

The answer is not correct English and (still) needs to be edited.

I agree, this needs to be fixed. Suggest "this wallet's sides are three inches long"

"the length of this wallet's side is three inches" - also there is an error when filling out the answer wuth the word bank creating a misspelling when using "wallet" and " 's "