If the central rise of a symmetrical parabolic arch is h, then the rise of arch at quarter points is

- 1
  
  $\frac{h}{4}$
- 2
  
  $\frac{h}{3}$
- 3
  
  $\frac{2 h}{3}$
- 4
  
  $\frac{3 h}{4}$

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