Oh honey, it's not rocket science. If Square is to Triangle, then Cube is to Pyramid. It's all about matching shapes like a game of geometric Tinder. So swipe right on Pyramid and call it a day.
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A triangular prism
It is a cube which is 3D whereas the rest are 2D.
There are three plane figures and cube, which is three dimensional.
The odd one out is the cube which is a 3D shape whereas the rest are 2D shapes if that is your question.
A square and and a triangle