Definition:Prism/Opposite
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Definition
Let $P$ be a prism whose bases are $P_1$ and $P_2$.
The opposite face of the base $P_1$ is the base $P_2$.
In the above example, the base $ABCDE$ is opposite $FGHIJ$.
Also known as
The opposite face can also be referred to as the opposite plane.
Historical Note
In the words of Euclid:
- A prism is a solid figure contained by planes of which, namely those which are opposite, are equal, similar and parallel, while the rest are parallelograms.