beginner grammar question

Im currently learning some Kanjis via WaniKani and i recently learned the words 大きさ (size) and 大きい (big)

So i wanted to construct the theoretical sentence "this is a big size".

(この)大きさは大きい(です).

Now i have a few questions:

  1. Is that sentence grammatically correct?

  2. I know that i can leave out the です when im talking to a good friend. But as far as i know you dont add a だ at the end of い-adjectives then. So does 大きい mean "big" or does it mean "is big"? Or is it 大きいい?

by Variskus

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