None.
Oxygen, as a gas, will occupy any shape that the gas is contained in. Oxygen as a single atom does not have a specific shape since its electrons do not have exact positions - only a probability space.
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the trigon have 3 side
One side and no angle.One side and no angle.One side and no angle.One side and no angle.
The top side is congruent to the bottom side, and the left side is congruent to the right side.
there are 2 faces on a hemisphere the round side and the flat side
A cross has 1 side. And that side is the point that the 2 lines share.