The rise of the jack arch is kept about.... of the span.

- 1
  
  $\frac{1}{8} t o \frac{1}{12}$
- 2
  
  $\frac{1}{12} t o \frac{1}{16}$
- 3
  
  $\frac{1}{16} t o \frac{1}{20}$
- 4
  
  $\frac{1}{20} t o \frac{1}{30}$

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