or Figure, is one contained by both right and curved lines.

Mixt Number, is one that is partly an integer and partly a fraction; as 3½.

Mixt Ratio, or Proportion, is when the sum of the antecedent and consequent is compared with the difference of the antecedent and consequent;

as if \[ \begin{align*} 4 : 3 &:: 12 : 9 \\ a : b &:: c : d \\ \end{align*} \]

then \[ \begin{align*} 7 : 1 &:: 21 : 3 \\ a + b : a - b &:: c + d : c - d \\ \end{align*} \]