The proportional perimeter of a circular sewer running partially half where K is the central angle subtended at a circular section of sewer is __________
(a) K/360^o
(b) K/90^o
(c) K/270^o
(d) K/180^o
I got this question in an interview for internship.
I would like to ask this question from Hydraulic Elements of Circular Sewers topic in section Hydraulic Design of Sewers of Environmental Engineering