[mikalauskas]

Minimax M2.1:

The inner diameter of the glass is *7*.

Here's the reasoning: - The coaster (diameter 9) sits between the glass and table, meaning the glass sits directly on the coaster - This means the *outer diameter of the glass equals the coaster diameter = 9* - The glass has a wall thickness of 1 on each side - *Inner diameter = Outer diameter - 2 × wall thickness* - Inner diameter = 9 - 2(1) = 9 - 2 = *7*