$$\left. \begin{array} { l } { \theta _ { n } \times 8 , 10 } \\ { \theta _ { n } c m } \end{array} \right.$$
$40cm\theta _{n}$
$$10=2\times 5$$
$$40cm\theta _{n}$$
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$8\theta _{n},\ 10,\ cm\theta _{n}$
