Learn Italian: La larghezza della fodera è di un metro. - The width of the lining is one meter.

The preposition a is used for rates, such as price per unit (e.g., costa cinque euro al metro — it costs five euros per meter). This sentence, however, is stating a fixed physical dimension, not a rate. To state a static measurement, Italian uses the verb essere followed by the preposition di.

Why do we say è di un metro instead of just è un metro?

While in English we simply say a dimension "is" a certain measurement, Italian requires the preposition di after essere to express exact dimensions, weights, or quantities. You are literally saying that the width "is of one meter."

How would I say "The lining is one meter wide" using an adjective instead of the noun larghezza?

You would say La fodera è larga un metro. Notice that when you use the adjective (largo/a) to describe the subject directly, you drop the preposition di.

How is the word larghezza formed, and what are the equivalents for length and height?