The ratio of depths at partial flow with central angle `alpha` and at full flow of a sewer, is Options: A . &nbsp1 - sin `alpha/beta` B . &nbsp1 - cos `alpha/2` C . &nbsp`1/2 ( 1 - cos ``alpha/2)` D . &nbsp`1/2 ( 1 - sin``alpha/2)` E . &nbsp`1/2 ( 1 - tan ``alpha/2)`

The ratio of depths at

Question

The ratio of depths at partial flow with central angle `alpha` and at full flow of a sewer, is

Options:

A . 1 - sin `alpha/beta`

B . 1 - cos `alpha/2`

C . `1/2 ( 1 - cos ``alpha/2)`

D . `1/2 ( 1 - sin``alpha/2)`

E . `1/2 ( 1 - tan ``alpha/2)`

Answer: Option C

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