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\begin{xy}
(0,40)*{正3角錐}="A",
(0,-3)*{3}="A",
(-5,8)*{3}="A",
{(0,8) \ar @{.}(-12,0)},
{(0,8) \ar @{.}(12,0)},
{(12,0) \ar @{-}(-12,0)},
{(0,8) \ar @{.}(0,35)},
{(12,0) \ar @{-}(0,35)},
{(-12,0) \ar @{-}(0,35)},
\end{xy}
\begin{xy}
(0,40)*{正3角錐}="A",
(0,-3)*{3}="A",
(-5,8)*{3}="A",
{(0,8) \ar @{.}(-12,0)},
{(0,8) \ar @{.}(12,0)},
{(12,0) \ar @{-}(-12,0)},
{(0,8) \ar @{.}(0,35)},
{(12,0) \ar @{-}(0,35)},
{(-12,0) \ar @{-}(0,35)},
\end{xy}
\begin{xy}
(0,40)*{正3角錐}="A",
(0,-3)*{3}="A",
(-5,8)*{3}="A",
{(0,8) \ar @{.}(-12,0)},
{(0,8) \ar @{.}(12,0)},
{(12,0) \ar @{-}(-12,0)},
{(0,8) \ar @{.}(0,35)},
{(12,0) \ar @{-}(0,35)},
{(-12,0) \ar @{-}(0,35)},
\end{xy}
\begin{xy}
(0,40)*{正3角錐}="A",
(0,-3)*{3}="A",
(-5,8)*{3}="A",
{(0,8) \ar @{.}(-12,0)},
{(0,8) \ar @{.}(12,0)},
{(12,0) \ar @{-}(-12,0)},
{(0,8) \ar @{.}(0,35)},
{(12,0) \ar @{-}(0,35)},
{(-12,0) \ar @{-}(0,35)},
\end{xy}
\begin{xy}
(0,40)*{正3角錐}="A",
(0,-3)*{3}="A",
(-5,8)*{3}="A",
{(0,8) \ar @{.}(-12,0)},
{(0,8) \ar @{.}(12,0)},
{(12,0) \ar @{-}(-12,0)},
{(0,8) \ar @{.}(0,35)},
{(12,0) \ar @{-}(0,35)},
{(-12,0) \ar @{-}(0,35)},
\end{xy}
\begin{xy}
(0,40)*{正3角錐}="A",
(0,-3)*{3}="A",
(-5,8)*{3}="A",
{(0,8) \ar @{.}(-12,0)},
{(0,8) \ar @{.}(12,0)},
{(12,0) \ar @{-}(-12,0)},
{(0,8) \ar @{.}(0,35)},
{(12,0) \ar @{-}(0,35)},
{(-12,0) \ar @{-}(0,35)},
\end{xy}
\begin{xy}
(0,40)*{正3角錐}="A",
(0,-3)*{3}="A",
(-5,8)*{3}="A",
{(0,8) \ar @{.}(-12,0)},
{(0,8) \ar @{.}(12,0)},
{(12,0) \ar @{-}(-12,0)},
{(0,8) \ar @{.}(0,35)},
{(12,0) \ar @{-}(0,35)},
{(-12,0) \ar @{-}(0,35)},
\end{xy}
\begin{xy}
(0,40)*{正3角錐}="A",
(0,-3)*{3}="A",
(-5,8)*{3}="A",
{(0,8) \ar @{.}(-12,0)},
{(0,8) \ar @{.}(12,0)},
{(12,0) \ar @{-}(-12,0)},
{(0,8) \ar @{.}(0,35)},
{(12,0) \ar @{-}(0,35)},
{(-12,0) \ar @{-}(0,35)},
\end{xy}